Lbg- it looks like your getting everything under control and learning all about fish keeping. About the live rock, I would get it. For my tank when I set it up, I put both base lace rock on the bottom and then pieces of fiji live rock on top. I like the live rock because it has good algaes and little organiisms to help clean the tank.
When you are looking into adding some fish, please please ask here before buying it. Fish stores will sometimes tell you anything to buy an expensive fish, that just won't work for your tank. Many lfs suggest damsels, I wouldn't because many of them can become quite aggressive when mature. Look up the fish that you like and then ask here for if they are all compatible too. I hope you tank goes well and you have fun in the process.
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