Hi, I'm sure this has been asked before but there are so many threads on this forum that I gave up searching.

Is there any new player guide by any chance? Or could anyone just quickly type what to focus on at the VERY early stage of this game?

I'm only level 19 at the moment, f2p, have one diamond Liu Kang, some gold cards etc. Do I focus on the campaign, faction wars, towers? I've worked out im too weak for any of the challenge events like the current Mileena one. Anything to avoid? I've been spending souls on gold packs so far and i opened a diamond pack once and got LK.

Basically, I'm clueless and would rather avoid stupid errors if I can.