To apply the stone, you’ll need Type N mortar. This is also used for mortar joints, if applicable. If desired, you may want to use iron oxide pigments for tinting. Other additives should not be used, unless approved by a building official.
Most applications will require a code-approved, weather resistant barrier meeting requirements of the ICC-Acceptance Criteria #38. Many applications will require code-approved, self-furring metal lath, or woven wire mesh, and appropriate fasteners. When installing to a rigid back wall, this will generally be 2.5lb galvanized expanded metal lath, and rigid corrosion resistant flashings, and a means of drainage.
Now that you have all of the tools and materials you need, it’s time to prepare surfaces where the stone will be installed.