Could be a fun project. Generally, the more information you provide, the more likely you will receive useful replies...
Post some details on what you plan to build, what you want it to do. Gives some details on size, and what parts and materials you have on hand. There are thousands of similar projects, many well detailed on the web. Many of the members here have built one or two mobile robots. Should be hard to get some help, but you'll need to get things started on your own. Nobody here can read your mind (except Space Varmit...).