accounts are different to lists you need to run your round. George runs your round and also records your income.
As regards doing the books part, keep all reciepts. Petrol will go into a page called motoring and will include mot tax ins and have a total.
Consumables and many other things are just an expense that you write straight off against profit so you add them up over the year.
Advertising keep seperate.
Computers keep seperate.
Fixed assets keep seperate, that's what you take the 25% off.
Mainly group things together that feel like they should be together.