Expenses (and Income too)
Keep all receipts for your business, required purchases, mileage, office supplies, other mystery shopping expenses, and home office (if you have a home office dedicated to this business).
A notebook can work just fine. However, many of us use spreadsheets because of the powerful abilities they have to do math and separate items into groupings, say calendar years, for example. It doesn't hurt that backups are easy too.
There is much assistance on the forums for you on the topic of taxes and others. Scroll through the threads or you can go to the IRS itself if you like. Try the Small Business and Self-Employed Tax Center there at [
www.irs.gov]
Welcome to the forums and good luck!
Happily shopping Rhode Island and nearby Massachusetts and Connecticut