After the Kickstarter is complete and funded, you will be sent an email with a form (Kickstarter calls it a survey) which you will use to get your rewards! If your pledged includes rewards were you work with the team to make things, we will ask for the best way and time to contact you and go from there :D
Thank you for supporting the original 2D game! We are very proud-- because of you that game is still online and being updated weekly. This Kickstarter is to fund and finish AdventureQuest 3D which is a brand new game. You must become a Guardian in this new game separately. This is your opportunity to help make this game, just as the original Guardians of the 2D game did.
Don't see the answer to your question? Ask the project creator directly.