I realize this is still in Alpha-Build, so there is no in-game tutorial. So may I suggest in the work shop adding prebuilt demo bots, so players can see what is needed for wheels and weapons to work. You could even add prebuilt wheel and weapon systems in part selection. Love what you are doing.
We are planning to work the player up into more and more complicated builds in the single player game, but we are a long way off from that right now.
In the meanwhile, the Discord community has a huge array of builds and premade things to try if you are interested!
The link for the Discord server is at the top of the page.