A quick tip is double is good in this game. double sneak (attacking back position) double snipe (rang hits first non mele card) or double heal are all good when starting off. pay attention to what beats you. here is my guide
https://steemit.com/gaming/@threejay/steem-monsters-starters-strategy-guide-six-huge-tips-to-help-you-rank-up-and-get-more-free-cards