Professions have much less to do with the class you play than most people think. It is very rare that you create a piece of equipment and actually use it afterwards. And if you do, chances are it could have been easier obtained from the auction house.
The leather-wearing Druid typically will benefit from most of the professions available to her. Tailoring and Blacksmithing are the exceptions, they are expensive, and the Druid can't wear plate or mail, and shouldn't wear cloth when leather has better armor bonuses.
The real advantages of your class lie in gathering the components. Druids are the best gathering class there is in WoW, as they can stealth and shift to travel form.
Skinning doesn’t really count as gathering, since the loot is right in front of you. If you want to take full advantage of the druid’s strengths, you’ll choose herbalism and mining. Druids can get in areas too high for their current level and harvest herbs.
As these two professions don’t require any processing, they are really not very time consuming and make for a nice and easy profit without having to worry too much about getting the right ingredients, not falling behind on your skill level making the right items to get a profit etc.
A Leatherworking / Skinning combo works well, allowing the Druid to make much of his own gear, and do the skinning to provide materials for it. Skinning is also profitable, many of the leathers made can be sold on the Auction House.
Another effective combo is Alchemy and Herbalism. And Herbalism is a great compliment to Alchemy. Alchemy potions can be used to make up for a lot of a Druid's weaknesses. A tanking bear Druid may not have as much health as a warrior, and a casting Druid won't have as much mana as a Priest. Potions can make up for those differences.
Engineering however is worth a consideration, since most of the engineering items are only usable by engineers. Gadgets like bombs, grenades, exploding sheep, rocket boots and mind control caps are not only a lot of fun to use, they can also decide PvP fights.

You will make much less money with mining and engineering, however, since that combination is obviously very popular on most servers and the selection of final products you can sell is very limited to say the least.
So here’s the plan. Ready?
●Start with herbalism and mining.
●Be on the lookout for herbs and minerals at all times. Switch between find herbs and find minerals frequently when traveling, they don’t cost any mana.
●Get everything you can get, unless you know the price is so low it’s definitely not worth your time
●Sell everything for a nice and steady profit. If you’re sure you want to change to engineering later, save the mining products you’ll need for that on an alternate account.
●After you get your mount and everything and you have a handful of gold to spare, you can spend a few hours leveling engineering from 0 to 300 in one session
●Enjoy the fun of engineering
If you wish to level engineering from 0 to 300, here is how to get to 260. You’ll have to skill the remaining 40 points with schematics you buy from the auction house or loot from monsters.
You will need:
50 Rough Stones (40s)
86 Copper Bars (5g85s)
40 Linen Cloth (1g)
30 Coarse Stone (2g)
135 Bronze Bar (11g)
60 Wool Cloth (3g)
20 Silver Bars (1g50s)
40 Weak Flux (Vendor) (35s)
20 Heavy Stone (1g)
20 Medium Leather (30s)
20 Gold Bar (4g)
40 Iron Bar (3g)
40 Solid Stone (3g)
40 Heavy Leather (2g)
160 Mithril Bar (24g)
20 Mageweave (1.5g)
100 Dense Stone (7g)
200 Thorium Bars (40g)

140 Runecloth (15g)

That’s 126 gold for ingedients from the auction house, but if you spent 60 levels selling herbs and ores, you’ll have earned a lot more. Prices may vary on your server. Make sure you have enough money to buy the necessary skills from the engineering trainers and some more ingredients from the local vendors. Now here’s how you get from 0 to 300:

You can sell all the stuff you don’t need in the auction house, but don’t count on great revenue here.