I know the feeling, I'm just starting my third career. I talk to a few friends and a sister that is accountant. They sugested that I get Quickbook Pro to put all my business info into, it has inventory, invoice, billing, credit cards, check register and then you can past it to a CPA to do you Taxes. The QuickBook site has a 30 day trial and training course for it. To me for the one's that are out there it's the easiest one for the price. Good Luck!