Of course you can have more than one account, in fact, it's strongly recommended that you do, so have a second option, should you lose your card to your first account, or your bank has technical problems.
For any account that has a minimum pay in requirement, you can meet this by setting up a standing order.
Eg receive your salary in one account and on a convenient date (eg the day after your salary goes in) set up a standing order to move some money from account A to account B. If the amount needed is too large, you could set up one that is the right amount, then another back to fill up your bills account.
Or you could get paid into account A, spend from that account and pay your bills from account B, and set up the SO to fund that account each month, assuming your bills are more than your spending and your bills amount meets the minimum pay in requirement.
You also want to put some money aside each month, for annual and irregular expenses like insurance, car costs, Christmas, holidays, white goods replacement etc. You might even want to divide this into pots, for things that are very likely to happen in the next year vs things that could happen but your not sure when.
Plus you can always move money between different accounts, eg if you have a big car repair bill, but all your electrical goods are fine for now (plus if you urgently needed something like a fridge or washing machine, chances are you could get it on an interest free credit deal).
On the matter of cars, it's a case of 'it depends'. It could be that, if you've replaced a few key parts, it will run cheaply for the next 2/3 years. But you're right that you should save with a plan to replace it, and when you do, it depends how much you have in savings on how much you spend as ideally, you shouldn't borrow to buy a car, but in reality, a lot of people do and it's fine, if an expensive way to run a car,but it's likely to cause financial strain if they lose their income and still have to pay for the car.