What if I don't send the complete amount from my paper wallet?
When you make a transaction, you will make a change output. This output can be to any address that you want, just as if you are sending Bitcoin to someone else. Depending on the software you are using, you can set the change address to whatever you want. You could send the coins back to your paper wallet address or you can create a new paper wallet and send the change there.

It is recommended that you do not reuse addresses, so you should create a new paper wallet and send the coins to that address.