anyone know a template etc for sending an invoice?

Check out it's free, and very good. Even handles basic accounting for you etc.

Perfect! On it now. How long do you usually give people to pay?

It depends on whether or not you discussed it with the client. Typically I give clients 7 days unless they request longer, never more than 30 days though.

Freshbooks, freeish -
Harvest, also freeish -
There are google sheets templates which will serve the purpose as well. I like them because of the simplicity.

I'm creating an extremely straightforward invoice app (with a time tracker straight on the invoice). Let me know what you picked.

Hey, thanks for tips but going with the one Daniel suggested.