World of Warcraft players, come in!

I'm a noob :3

 Spoiler

I'm having so much fun doing quests! So happy that quests are actually worth it.
I have 3 questions though...

I found out how to get an extra action bar but I can't find out how to set keys so that I don't have to click. I tried google earlier but I can't understand much...
I tried playing a Mage, had lots of fun but I died so much I ended up quitting it. I saw someone in guild saying mages could tank... or that they don't die that muchbut I don't get how
How do I choose professions? Like what benefits a druid the most? I chose herbalism and alchemy because it gives me free pots but I have no clue if it was the right choise.

If you go into the menu, keybindings is one of the options, that what you want. Each action bar has a different number.

I have no clue how mages can tank, i do know that frost mages have a few defensive moves though.

As far as professions, herb and alch are good choices. Without going into a ton of detail, druids are really good at herbalism, because once you can use flightform, you can just fly from herb to herb, no need to dismount like other classes, saves a lot of time. Alchemy is also a good choice, works well for any class and spec and can make money at 85. If you get really serious about raiding or pvp, you would want to drop herbalism, but dont worry about that now.

Druids are a great first character, jack of all trades and really good at them all too.