Originally Posted by Sai'ix Renkai
Disregard. Block for new players can be difficult. Learn the game in unlimited, get comfortable, then move on to block. Especially since block changes often, you should definitely work on getting the hang of everything first. Medical decks aren't block, because you don't have any of the good stuff in block, so don't get too attached if you wanna switch. I have a few decks in both formats. Try that.
Much as I detest unlimited, this is probably a good idea. You'll have access to literally all cards (including new ones) that aren't banned so you can get familiar with a lot of the games concepts, play style, and generally how everything goes. Then, once you're confident you know what you are doing, you can move on to block format and build a block legal deck (and from there go to a tourney sometime even)
Welcome to the boards! It seems my guide has already been linked to you, read it well, and enjoy your stay.