Here's another important item. Don't ever put off paperwork, especially bookkeeping. Send invoices within 24 hours of completing a job.

If you plan on doing your own bookkeeping, I can recommend QuickBooks. It will do your invoicing & check writing.

For other forms, try NEBS, they've been around for years & give good service http://www.nebs.com/NASApp/nebsEcat/index.jsp

Few things are harder to put up with than the annoyance of a good example.