Yes. Christ and nothing else. Either you put your faith in God's Substitute as being sufficient to atone for you, or you do not believe He is sufficient, and you try to go your own way (add to it). John 10:9 Jesus said: 'I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture'.
John 10:1 ''verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber'.
Romans 6:23 'For the wages of sin is death; but the GIFT of God is eternal life through Jesus Christ our Lord'. You do not work for a gift, which is why it is repeated in Ephesians 2 'it is the gift of God. Not of works..'. Why? Because either you believe Christ has paid the payment in full or you don't. And He is to get all the glory: 'Not of works lest any man should boast'. Another verse on this point would be Titus 3:5 'not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost'.
And what you have pointed out about good works is very important.
Good works come AFTER saving faith. True good works are an evidence that someone has been born again/regenerated by the Spirit of God. Good works do not save. Again, just as we cannot save ourselves but Christ receives all the glory for saving us, so too, good works are to be all for the glory of God, not to try to work our salvation. If someone thinks they can save themselves by their own works, these "good works" are as filthy rags, they are not accepted by God for the forgiveness of sins 'without the shedding of blood is no remission/forgiveness': hence why Christ had to die.
In our own fallen nature, we are (as ephesians 2:1 puts it: 'dead in trespasses and sins'. Romans 3:12 says 'there is none that doeth good, no, not one'. Isaiah 53:6 'all we like sheep have gone astray, we have turned everyone to his own way, and the Lord hath laid on him the iniquity of us all'.
We cannot cover our own sin, and an unregenerated heart cannot present to God with a sinful heart some bundle of an offering of good works that will merit saving favour. 'Even when we were dead in sins, [God] hath quickened us together with Christ.' Ephesians 2:5.
It is really important when reading Scripture to bear in mind who each passage/letter is addressed to. This epistle to the Ephesians (specifically chapter 2) is addressed to the born again believers, its not addressing people who are not yet born again. So yes, it is speaking to those who have been regenerated/quickened (Ephesians 2:1) and is instructing them that they have been quickened/regenerated FOR the purpose of good works, NOT that they are saved by the good works: it explicitly states to the contrary.
You asked: 'so literally all you need to do is accept Christ as your Saviour and nothing else?'. Saving faith/accepting Christ as your Saviour goes hand in hand with repentance. And again, as per Ephesians 2:8,9, it is not your repentance that saves you, it is by grace through faith which is a gift. True repentance is a saving grace given by God where a sinner, being truly aware of their sinfulness, understands the mercy of God in Christ, and with grief and hatred of their sin, they turn from it unto God, with full purpose and endeavour after new obedience. Luke 24:47 'and that repentance and remission of sins should be preached in his name among all nations'; Mark 1:15' repent and believe the gospel'; Luke13:3 'I tell you, nay: but except ye repent, ye shall all likewise perish'; Acts 17:30 'And the times of this ignorance God winked at; but now commandeth all men everywhere to repent'.
In answer to your question about confessing our sins: yes, we are to confess our sins - but not to other mere mortal, sinful men for forgiveness (there is one God, and one mediator between God and men, the man Christ Jesus' 1 Tim 2:5), we are to confess them directly to God, with Christ as the one who mediates for us (I.e. 'no man cometh unto the Father but by me' John 14:6). James 5:16 is referring to confessing our sins for when God has brought an illness on a believer because of their sin, they are to confess that sin to God and to others, that they will be forgiven by God and that they will have the support of fellow believers by their prayers (not that the prayers of others will be a means of their forgiveness - again, only Christ - but that they will be supported): we are taught in many places in Scripture to pray for other believers, for many different reasons, but the prayers of others cannot absolve our sins. Scripture interprets Scripture.
And in answer to your last question 'can you live any way you like as long as you proclaim to accept Jesus into your heart?': no.
If you have truly repented of your personal sin and if you believe that the Son of God suffered for your own personal sin on the cross and took the wrath of God on His own body there for you, then you absolutely will not want to live for yourself, but for God. 'We love Him because He first loved us'. This is where works come in: works are, as it were, fruit. A true born again believer WILL have fruit in their lives that they are God's (God gives the born again believer many different kinds of assurances). Matthew 7:16 'ye shall know them by their fruit'.
True repentance is serious: if you are truly repentant there will be a change, and the sin you once loved you will no longer love but it will be putrid to you. This change, again, is made by God, not by us, we can no more give ourselves a new/regenerated heart that loves God and hates sin anymore than we can gain entry to heaven by works, again read Ephesians 2: 1-6. The quickening that is spoken of here is a supernatural work which only God can do.
Will He do that for you? Remember God is Truth and cannot lie: He gives the promise: 'For whosoever shall call upon the name of the Lord shall be saved'. That whosoever means you @searchingsearching IF you call on Him. Ezekiel 36:26 'A new heart also will I give you, and a new spirit will I put within you'.