I am going to replace the tile around my gas fireplace. The plan is to use Air Stone for the wall portion and some tile for the floor portion. My questions are:

1.) Do I need mortar and grout for tile? If so, what kind?
2.) What is the correct trim for the floor tile?
3.) Do I have to seal the floor tile?

I have attached a photo of the fireplace and the floor tile Inwill use. Thank you