You're asking a question that's been answered a multitude of times on this forum....you definitely need to use the search tool and do some research. I will tell you that when I prepared to build my first shop in 2007, I spent literally hours on here, perusing the Garage Gallery sub-forum, in order to collect a long list of features that I wanted in my build. I'd estimate I easily spent 30-40 hrs, or more, just looking through as many of the builds as I could, over several weeks time.
Your comment about "keeping it simple" makes most of us that have built shops chuckle.....this is The Garage Journal, and we live by the antithesis of that concept, lol! The reality is that you only get (essentially) one chance to incorporate some of the things you'll likely want to make part of your design/build, so doing your homework now is very important. Very. Otherwise, you'll either do without, or spend a bucket load of $$ at some point in the future to have some of those missed items.