You need to get paid! Bottom line it is not a business if you are not being paid. Here are a few great invoicing options from free to paid but all professional.
Accounting and invoicing made sooo much easier with Freshbooks.
One of my favorite productivity tools!
Also - FreshBooks is recognized as the #1 cloud accounting solution for small business owners.
As a solo – entrepreneur you understand the term 17 hats or maybe even 17,000 hats? The 17Hats system provides an excellent option for invoicing. If you are thinking about streamlining, templates and invoices check out 17Hats.
When starting out you could utilize free invoicing templates. This works... it might not look as professional as you might want to appear but its a good place to start.
Thanks for sharing!