I use a duplicate pad, which is numbered. It has blank sheets and I just fill in a name & service provided & amount. Then, eventually, I tranfer all this into a huge red very wide book.
It has columns in it, which I put in my income (Clients individually monthly) the all the other colums are things like...
Petrol/garage repairs/mot/servicing etc
Stock - cover everything including cleaning products
Equipment
Clothing
Insurances
Advertising/Promotions
Printing/Stationery
Miscellaneous - client drinks/xmas cards etc
Wages (inc to myself)
Education/courses
This is just a selection of the things I have, in no particular order.
Basically, after I've filled this in, add each column up at bottom of page and transfer to top of next page etc.
HTH's xxx