Getting the right equipment is a real challenge for druids. Depending on your build and the roles you have to take you need different sets. Usually you end up carrying around multiple items for each slot. You’ll have to deal with gear issues much more and longer than any other class. In the following chapters you will learn the basics, get recommendations for different levels and purposes and get a good idea how to get the necessary items.
Armor
On most servers there is a lack of capable healers on both factions. This said a healer is probably going to lead to the most (returning) group invites. For this purpose you want to focus on int/sta/healing items to play this role with a maximum of efficiency. Usually though at lower levels the +healing items aren’t that great and you’ll be better of with stamina, hit point and intelligence gear till your 50ies.
The “basic” green stuff that matches grouped equipment requirements is the “eagle” armor (xyz of the eagle). It provides decent int/sta increases when you can’t get your hands on any specific quest rewards or blues. If you are going for feral (solo) equipment the equivalent would be “bear” armor. Of course those randomly dropped green items won’t provide any outstanding equipment, but the difficulty of the level progression part of the game was designed with this outfit in mind. Another advantage is that you don’t waste any time browsing the Auction House or trade channels. Unless an enchanter buys them, you can get pretty much all of that stuff at the minimum price. This gets you up to level 50 without any major drawbacks in groups and is an easy strategy for anything that you outlevelled by far. Of course specific quest rewards and blue items outperform the standard armor, but going out of your way for a single piece usually isn’t worth it. The time you spend at less than optimal experience spots trying to get it is not being made up through the additional efficiency gained through equipping it.

If you are going the solo route you should focus on damage output and that alone. Maximum DPS (strength, attack power for ferals, int and +damage for casters). Anything that requires in-fight healing or takes your hit points down to a dangerous level is too difficult to be killed solo for experience (low efficiency). In any case the by-level list below lists a few recommendations for each level range for things that you might want to watch out. A lot of it depends on your build and play style, so this can only serve as a general orientation.