Hey 
I'm new to the game - So there are some questions left 
1. How can I get 150hp?
2. How can i double or even triple up my Mark?
Thanks 
As of right now, you can't do that to yourself* in general. You
can do that to decks you submit to be used by the AI in arena - your "level" (based on your score) gives you "skill points" that you can spend to give bonuses to the submitted deck. Anything you're actually playing yourself (not having played by the AI) is going to always be the same base attributes (100 hp, single mark) at the start of the game.
*: There are actually mark cards (which you can acquire by winning tournaments and events) which you can put in your deck and which, when played (assuming they match your chosen mark) will stack with your mark for that game which would allow a 2x or 3x (or more) mark to be obtained within a specific match. However, this still doesn't let you acquire the attribute bonuses from the beginning of the match like you'll see in the AI.
As another little side note, the potential exists that some sort of player attributes may happen in a later patch. To the best of my knowledge it is not confirmed, though.