Tile with a good texture is good. I use slate tile that is reddish orange ( it looks great and is easy to clean). I just lay mine down on top if felt. Most importantly, choose a tile you like!
Yes, but not so much that it would catch in his claws. It definitely has texture, but not too scratchy so it won't hurt him.
When I first came to BeardedDragon.org I felt so overwhelmed and I was using sand (with Pudgy). When I read about tiles I felt like, "HUH??" Then I just looked at the Viv thread where people have all their pictures, and I went to Home Depot for Doc and it was easy. I say definitely go to Home Depot and as soon as you see the tile, you'll know it's the right one for you and your beardie.