I have had an idea for a gamemode for a while, but it would require controlling a prop in third person, with the directional keys applying forces to the prop in their respective directions. A good example of what I am trying to achieve is the Melon Racers game from GMod 9.
How would one accomplish this in GMod 10 Lua? I have some basic experience with Lua, and a decent amount of overall programming experience. If one simply were to explain a basic outline of how this could be implemented, it would help me greatly.