Arcanist tips?

[Sagittarian]

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.
*snip*
(If you decide you want Scholar later, you can change them to Mind at that point if you want.)

Since it wasn't mentioned, if you want to try Scholar you need to get Conjurer to 15. You'll still want Thaumaturge at 26 for swiftcast, so you may as well start with that.

As for anything you should probably already know:

1. Summon 2 (topaz/titan) should only be used when soloing.
2. Summon 1 (emerald/garuda) has a knockback. Keep it on obey so they don't use it accidentally.
3. DOT everything and refresh as they expire.