Having been down that path, I would recommend an app like an old copy of QuickBooks, an online app like Freshbooks, or an open source equivalent. (eBay?) It mak

Having been down that path, I would recommend an app like an old copy of QuickBooks, an online app like Freshbooks, or an open source equivalent. (eBay?) It makes it easy to be organized and establishing a good system early on gives you time to think about important things.