When baby is first born, you keeping bringing them to the boob for them to feed. The more this happens the more your milk comes in. My baby fed 3/4 times in the first day ( was feeding within 30 mins of birth). Also, your baby knows what to do and will instinctively search out the boob. They are clever little cherubs :) Keep an eye out baby swalloing and sensing they are getting something. They only need very very little amounts in the beginning even thought it might take them 15-20 mins to get it. If baby is hungry they will not likely sleep or seem comfortable so you will know. So long as they seem content then everything is fine.
For milk and bottles - I wouldn't worry about this to start with. You can buy in Boots newborn ready made milk bottles that come with the teats and you can just use those if you want to in the first few days. But again if you want to breast feed the best way is to keep working at it. I bought them but didn't need them, but I felt assured knowing they were there.
Depending on what time you have your baby and how it all goes, you might not stay in a night on your own. My baby was born at 4am and we were home by 10am, DH didn't leave my side. Even if you are on your own, the midwives will help you. Baby will sleep a lot in the beginning and you just need to try and feed about every 2-3 hours. again this helps bring your milk in.
For clothes, there is a rule of thumb that says 'always one more layer than you'. A winter baby I would have on a Long sleeve vest, a warm all in one body suit, mits and hat, and use blankets to wrap around and layer up then remove the blankets if baby seems warm, The hospital will be nice and cosy and you will need heating on at home.
Sounds like you've got the essentials covered. Baby will be very sleepy and just want lots of cuddles for the first few weeks. You might want to try a dummy, after 4 weeks, you can get small ones as they do help settle but its your choice.
If you buy any cuddly toys or books - get the black and white ones to start with as they are the colours baby see's until around 10-12 weeks old.
Don't forget to buy for yourself! Get nice maternity pads as you will bleed quite heavy for a day or two then normal sanitary pads are probably ok after that. You might need some breast pads as you will at times leak milk. Also buy some Lansinoh cream an use on your nipples even if they feel fine - this will prevent chapping and dryness and soreness as you progress with feeding.
That's about all I can think of for now!