I have a Druid also... they are awesome
Anyway, It all really depends on what spec you are (spec means what you spend ure talent points on). You wanna make sure that your spending your talent points on one specific category. What you spend your talent points on very much depend on what kind of armor you should have and stuff like that.
If you have spent your talent points on different categories, you can refund your points in exchange for gold at any major cities.
If you are Balanced spec:
You should focus on Leather armor with high armor points and a +spirit effect. You wanna make sure you have a high defense and health points so you can deal damage and not stand there being attacked trying to heal yourself. If you are balanced spec and like to attack using your magic, thats good to, but make sure you get some armor that up your mana points and not as much your health, but remember, health is also important to have. plus from balanced spec you get Moonkin form that up your defense and magic power.
If you are feral spec:
Focus on your defense and health and not as much your mana, because if you are feral spec, chances are that your are tanking it up in bear form or helping deal damage in cat form and not standing back being the healer. Leather armor should be your choice here, definately not cloth.
If you are restoration spec:
You should focus on having lots of mana, health is good, but not your biggest concern. Leather armor is ok here, but Cloth armor seems to have more things on them that help your health and mana but not really your defense. If you are restoration spec, you wont be up and battling head on, you will be standing back and healing the group you are in. I would suggest Cloth armor here, but of coarse it should have things to help your mana and health. No point in having cloth armor if it doesnt help you.
Im sure since you are lvl 37 you are doing Instances (Dungeons) with other people.
Now, like i said, i have a druid also, and when they are lower lvl, they arent the strongest type of character, but once they get around 45-50, they own... alot of the times when i do the battlegrounds, i have the highest amount of kills, and im only lvl 57 and killing 2 or 3 lvl 59's at once.
If you are in need of some armor, try the Auction Houses, if you find something, try to get the cheapest one of that item to help save some gold.
Hope i helped