Looking for expert opinions

[Sarina]

I am just in the process of setting up my first reef tank. It is 28 gal bow front and I plan to house corals and fish. I have most of the supplies needed to set it up however I have a few questions:

1. What would be the best type of filter for this system?
2. I really like the look of sand as the substrate but I have been told to go with a bare-bottom as a beginner - does it really make a difference?
3. How much live rock should I start out with, when do I add the rest?

Any insight and helpful tips you can provide me would be greatly appreciated!