Once you add your bank card you will be able to make purchases and the payment will come directly from your bank account through to paypal then to the recipient. If you want actual funds in your paypal account then there is an option to add funds VIA your bank card/s but it is unnecessary if you have your cards already added.
The easiest way for me is to go to a local gas station or pharmacy story and buy a Paypal mycash card. There's a 3$ fee for any amount from 20$-500$ but it's a simple way to get cash onto your Paypal. Goodluck!