Bow: In Act 1, it is very important to aim for a bow that gives really solid flat damage. Generally speaking, you don't want to invest any higher-rarity resources like Alchemy Orbs, Artificer Orbs, Exalted Orbs, or Regal Orbs. The ideal base would be a 
Warden Bow. These bows can drop around level 11, or you can find them at vendors.
Quiver: Try to find plus levels and flat damage!
Flask: Make sure you're constantly upgrading them! Here are the level start up for new flask [10, 16, 23, 30, 40, 50 and 60].
Boots: What you're looking for is any form of movement speed and resistances ideally cold resistance early or lightning resistance .
General Gear Tips: Generally speaking, you're looking for flat damage on gloves, weapons, and rings. When it comes to armor, ideally you want to go with an evasion armor base, but it doesn't really matter in the grand scheme of things as long as you have good HP, respectable armor and evasion or energy shield, and solid coverage of resistances.
Also, constantly check the vendor early on every 2 levels, give or take, as their inventory refreshes and you could possibly find some of the gear mentioned above.
Currency/Crafting Tips: Throughout the campaign, at all times, you're selling rares unless they're needed for gear upgrades. Any time you see quality gear or gear with sockets, you want to break those down for Artificer Orbs or other quality-adjacent currency so that once you get to the later acts, you can use those resources for gear progression. Gold is used very heavily for gambling, and once you finally get something of value, you can use your orbs and quality currency to really push your weapons and gear to an appropriate level.
Witchhunter
Mercenary
Ice Shot Witchunter. This will be a detailed leveling guide that can transition into the end game.
Lightning Arrow and 
Lightning Rod Or 
Poisonburst Arrow, 
Escape Shot and 
Freezing Salvo
