Spacing is a matter of personal taste and the design of the tile---
A very square cut tile like granite usually looks best with a small space--1/16" is common
The more common rounded edge tiles often look best with 1/8 or even 3/16"--
I suggest that you lay out several tiles--space them so they look good to you---then measure the gap and see what you have----
As to grout----unsanded for 1/8" or smaller----sanded for any thing wider---Read the package.
-----Mike-----
A very square cut tile like granite usually looks best with a small space--1/16" is common
The more common rounded edge tiles often look best with 1/8 or even 3/16"--
I suggest that you lay out several tiles--space them so they look good to you---then measure the gap and see what you have----
As to grout----unsanded for 1/8" or smaller----sanded for any thing wider---Read the package.
-----Mike-----