Setting different Order Status

I am a complete novice at all of this and I'll admit that I know nothing and have a massive headache.

I'm trying to set up the PayPal Express Checkout and I need a little handholding...

Where I need to:
Set Order Status
Set Unpaid Order Status
Set Refund Order Status

...should I just go with the defaults?


Please forgive my ignorance. I appreciate any help you can give...

Yes, just use the defaults unless you have specific reason to do otherwise.

Thank you very much :)