Quick word of advice: Read the battler guide. Namely stats. Speed and Level are almost useless, and level should only be done when all other stats are done. It only allows you to train skills. The max you can train in skill is 2.5x your level, so be careful leveling up before working on str/def/hp.

I can tall you much more, but the guide has all of the good info.

lul k. REVENGEEEE IMMINENT.