Using one's skills

So, here's the deal. I've not been playing WoW long, not even two months yet and I've only just set up my own account on the game. I'm reasonably used to playing as a rogue because that's how I started out, but now I'm levelling my warrior I'm finding that I just don't use half of those shiny little buttons. I've sorted out my key bindings so they're logical and close to each other but I still feel like in battle I'm relying on Heroic Strike, Sunder Armour and Rend (usually in that order!).

How can I make sure that I'm getting the most out of my skills?

My one and only 70 is a 70 warrior called Goreshakh and when i play him i usually just spam bloodthirst and rampage gets a click when i crit but your right warriors just generally dont have as many abilities due to the fact we are the simplest form of fighter we run in hit lots of stuff and run out then run in again.