It depends on the material you want to use. You can stencil it, use tile, wood, stone, etc. Decide what to use and go from there, Rita.
As with other home improvement diy projects, thorough preparation of the surfaces and using quality tools and materials are some of the keys to success. Unfortunately, many folks try to cheap out by choosing the shortest route and the lowest price, only to have disappointing and short-lived results.
Here's one easier way to do it: https://thehoneycombhome.com/how-to-install-subway-tile/
I did ours with 25 cent, 8 inch ceramic floor tiles, on sale at Lowes! You can really use anything, just get your idea in your head and look for the materials. THEN Google the how-to and get started.