If you want to stay DPS (at least for the time being), then the next thing you need to do is level Thaumaturge to 15 so you can unlock Summoner. (As Garotte mentioned, you'll want to get it the rest of the way to 26 for the Swiftcast skill at some point, but the first step is getting it to 15 for unlocking your job.)

Put your Arcanist skill points into Intelligence for now. (If you decide you want Scholar later, you can change them to Mind at that point if you want.)