While bookeeping isn’t the reason you got into business, it is the only way you can keep track of how you are doing. Think of it as your scorecard (also the if the IRS ever comes calling think of it as your saving grace). There are several accounting packages that you can use such as Quickbooks or [1] Microsoft Accounting that are relatively easy to use.  The Microsoft accounting program, express edition is actually free and integrates with MS Office (follow the link above).  This helps you with your invoices as they are tied into your accounting system and gives them a real professional look.  One other benefit of using an accounting program is that it should save you money with your tax accountant come income tax time.