1. Personally I'm happy to see a new class without summons. Before Arcanist, all new classes had at least 1 summon, so it's good to have a more standard class in that way.
2. Lightning staff, pillars of nirn, deadly, velothi ur amulet, and 1 piece slimecraw. it's stamina, mid range. You use Flail and not Runeblades to build crux, and you don't need to be in melee, just be close enough to hit with Flail and beam.
i really like pets, but most pets are really disadvantageous in this game, mainly because their dmg is not great (or in blastbones case clunky and buggy) and they take up a skill slot, not to mention cannot trigger any procs from your gear
out of all the pets, i think the warden bear, or companions are the best pets (companions dont take up a skill slot, have customization options, and can be used on any character)
my arcanist right now is using bow/bow, im still kind of figuring out the skills a little bit but i can generally do all of my dmg from 20 meters away pretty comfortably, definitely with a heavy focus on beaming