Yeah the reason why your wheels are spinning is because your clutch spring probably snapped, read the first post of that thread ksnitro has a link to. That's probably also the reason why your motor keeps stalling when you hit the brakes. And just a warning you'll probably be needing a new glow plug real soon. The first one doesn't last very long after the break in.
But yeah man, you're gonna have to calm down. These things take a lot of patience.
Remember... breathe... it'll be alright...[8D]