No, all you need to do is to: agree to the license terms and agreements & log in with your paypal account. Pretty simple.
Add 2 beats with the same license into the shopping cart. That's it. The price will change automatically.
You get different rights and different files for wach license. You can read everything here: https://victabeats.beatstars.com/licensing-info
Yes, you can. It depends on the license, how far you can go with the rights. You get all the informations you need here: https://victabeats.beatstars.com/licensing-info
You can buy the same license again or the next higher one. But if you're going to be the next superstar, you should think about an exclusive license. Just write me an e-mail and I'll help you out.