Board Thread:Questions and Answers/@comment-54.79.85.81-20150606111606/@comment-26021614-20150606220129

Zoom through quests to make gems, log on daily so that you can get more gems that way too. When you're high enough of a level, the bosses will give you plenty gems. Also Frontier Hunter when it comes around is a great way to get gems, zel and karma, as well as useful spheres, enhancing units, etc.

As for experience, Monday dungeons will get you tons of experience. Just keep spamming whichever dungeon you can handle and you should be able to level up before running out of energy since you're still a low level, and especially since it is currently 1/2 energy cost.

What I do since I don't pay for the game is I don't use the rare summon gate until there is an event where I can get an extra unit for every x amount of summons, that way I can get more units for the same amount of gems.