My question is, do i have to add funds to my paypal account if my credit card is registered in paypal as well?
Hmm, not a paypal genious, i tend to stay away from it, never trusted it. But from what i understand, paypal is like a online bank sort of. You set up your bank account, which means you have whatever funds are in that account, and just keep using it from there.

Didn't know paypal let you sign up with a CC and charge stuff like that.