Here are all kinds of shiplap tutorials for you from right here on Hometalk: https://www.hometalk.com/search/posts?filter=How%20to%20shiplap
I am sure you will find one that will suit your level of expertise.
Tung and groove boards that you can purchase at your hardware store will create a shiplap wall! :) Paint them white once they are installed.
Here’s how we did a vertical shiplap look: https://www.frugalfamilytimes.com/2018/05/how-to-make-vertical-shiplap-paneling.html?m=1