Good luck getting started with Steemmonster @numpypython !
I had a quick look at you collection so far and leased a couple of basic cards that might help you get going.
2 fairly cheap cards I would recommend getting is the armorsmith (0.18$) along with the Silvershield Paladin (0.36$) for the Life deck. The shield regeneration pretty much crushes all non-magic decks.
Enjoy the game, the start and trying to get up there (resisting the temptation to throw money at it to win) learning all the rules is a fun part. Once you are at a certain rank it becomes much more a daily grind with some earnings and card rewards as the most fun part :)