Honey Onyx

   I need advise on Honey Onyx going to be installed in the masterbath. 12x12 polished on walls and showerwalls. Floor 12x12 honey onyx and marble basketweave. Shower floor 2x2 honed/tumbled honey onyx.
What tpe of thinset? , type of grout and color grout?
What tpe of sealer or sealers for the differnt tile finishes? and should the tile be sealed before or after grouting? and care and maintanence for these tiles?
I grew up Italian with marble and stone in my parents house and still 55 years later it looks good. I do not expect it to stay shinny new. stone is stone.
I would appreciate any advise.
Thankyou, Norgiana