Early boss kill order for a smooth experience:
Devourer > cold witch > hut witch > rust king
Grab lightning infusion after killing devourer.
In act 1 it's very important to have gear with flat damage to attack, this can be any element or phys. At lvl 11 you want to get a
Warden Bow with 1-2 sockets, place a desert, glacier or storm rune in here for a big boost in DPS (storm rune is the best, but any will do).
Also look at the vendor in town every 1-2 lvls for flat damage gloves, every flat for the build is massive in at 1
Movement speed on boots is also extremely good if you can find them, try to search the vendor every 1-2 lvls. I would never swap out movement speed boots, only replace them with other boots that have movement speed.
Besides that you're just looking for life/resist on gear, but flat damage is the most important on gloves/rings.
!!!!Important!!!!!
Always salvage weapons with quality for whetstones and always salvage items with sockets for artificers orb, this is extremely important for gear upgrades throughout the campaign.
I also personally prefer to vendor all rares for gold to gamble in act 2 and act 3 for better gear.