From looking at the photos I would say that's probably enough rock. You got some really good quality stuff. loads of zoa's a few mushrooms and a couple of other bits and bobs on there. Much, much higher quality then the stuff I can get in my LFS's.
I agree with your LFS on live sand, complete rip off and I have know some people that have used it and then had massive ammonia and phosphate spikes because of it (if you using it already and you are in the cycle it don't matter though. I'm impressed with your LFS for telling you this though. A lot of them will talk it up and tell you how good it is because they have a much better profit margin on it over normal sand.
When scaping your rock think about water flow. You want the rock to be stable but you also want as much space around each bit of rock as well to get the most water flow around it as you can.
Have fun with the torch and be prepared to get a few late nights and you stay up till 3 in the morning looking at rock in the dark
If you have any food pellets drop one or two in before the lights go off and then check out what comes out to eat them.