In the end, there wont be much that any addons or UIs can do to help you level, but they will make the game look nicer, and put some of the information in more easily recognizable places.
Once you are Max level, the addon known as Weak Auras is probably the most useful thing when getting to know a class.
There addon is very versatile and can make visual indicators for literally EVERYTHING a class can do. There will be people out there who have built packages for it to help others know about key abilities' availability, cool down, duration, proc, etc.
That's something to look at down the line though, as since you don't have most of the abilities until later, the addon wouldn't service you well.
Okies, installed. Having a little learning curve re: macros. Not sure what I should be macroing and binding to which keys, etc. When the binding has more than one letter in the textual reference, I'm not always sure what key it's referring to.
Also, I'd be nice to have some type of loot macro.
You can rebind the keys to something more comfortable by doing /dom in the chat then hitting Bind Keys and mouse over the button you want to change and bind it to what you are comfortable with. In terms of a looting macro im not sure you can get one, but you can setup a Loot all by going to Interface > Game > Controls and ticking Auto Loot. You still need to right click on the mob but it will loot everything!