Welcome to AA!
You can stick with the dry rock if you have enough of it. The whole lot will become "live" in appearance after a few months. You should aim for 1-2lbs of rock per gallon, so rinse off and use the dry rock you already have and get more live rock if needed. During your cycle, bacteria will colonize any type of rock in the tank, rendering it all "live".
Protein skimmers are very useful, especially if you want to go reef in the future. I'm not too knowledgeable on the specifics, so someone else will have to help you with brands, etc.
Powerheads are important for creating adequate water flow. I'd say Koralia are the most popular type but you can get pretty much any ones you like.
For lighting, the best options available right now are T5 HO
, Metal Halide, and LED
. T5 fixtures are going to be the cheapest right now and have been well tested with reefs. Metal halides put out a lot of light, but they also create a lot of heat and can be expensive. LED
fixtures are starting to gain popularity for being very efficient and for not putting out much heat. Since it's a new technology, it's pretty expensive but you can find deals here and there. I'd recommend going with a T5 light to start out, and upgrading down the road if needed.
Feel free to ask more questions. I'm sure a few more experienced reefers will be able to help you out.