first you go to the crafting guild master. Then you accept what he says. You have skills n all crafts and put some on your quickbar. Now click on the icon in the quick bar and click on one of the highlighted items. Click it and drag it onto the quick bar. Right click the item and it will tell you what you need to make it. Then you need to buy supplies from merchants. The you go to a forge etc. and click on the item and you will either make it or fail making it. And there isnt really a best crfting skill for a druid. Its just the craft you would like to do the most.