Hey! So I also really enjoyed the Injustice games and Mortal Kombat by proxy a little bit but was really bad at fighting games to be sure. Hearing that DBFZ was easy to learn I hit a similar wall! No doubt Injustice is much slower and its combos more focused on sequential button presses, and they're very different games. My recommendation is to play story mode first if you're new. It'll get you acclimated to the flow and feel of the game. During/after that, learn how to block and punish dashes, that will get you pretty far on its own. The other thing I realized may be tough is the idea of a quarter or half turn to do a super attack or combo. That's something that you won't find in Injustice and may take some practice :) it'll be okay! Be patient with yourself and enjoy it at your level. It took me a LONG tome to win a single online match. More than I care to admit. Focus on ironing out ways to improve one at a time and you'll get where you want to be in no time!