The only books I keep are categorized receipts.
Every time I spend a dollar it goes in a box. At the end of the year I separate every receipts into type of item. I separate utility bills from supplies, from advertisement, etc.
If I did not get a receipt for something I write it down on an index card w/ the month, amount & item bought.
I then break each category into months so I can see I spend 100 on fragrances in Jan, 60 on fragrances in feb, etc. Like a chart.
It's not sophisticated, but at the end of the year I can see where every penny went.
All of my sales get written down in receipt books so it is easy to tally up how much I sold that year & I can also break what sold down into %s. 22% of my sales were scrubs for the year, 8% were body washes, etc.
If I were smarted (and I may try this this year) I would have 12 boxes or envelopes, one for each month!