Don't expect a lot, unless you're willing to drop a few hundred dollars. You get enough free gems to build 1 free deck, if you know what you're trying to build. That'll be your only deck until you save up for the next few weeks or months. Also if you delete the game your account is lost, unless you linked it to a Konami account, or remember to write down your 9 digit ID number. Your username won't be enough to recover your account. It's good on the surface at least.