a track for racing usually consits of tubbing to seperate lanes, also it uses dirt (of course). some jumps, burms, and the most imoportant a drivers stand.

Honestly, your best get would to kinda star to design it as you go, because that way you can tell how long to make the table top, or were to put the landing, or whatever. I would just start with the straight and a burm, then the jump you want. Have the beginning like you want, hit it with a truck under race conditions, and see were the truck lands, then make the landing there. That way you don't have a jump thats 20 feet, yet people undershoot it by 5 feet no matter how fast there going. Understand?

This is the track that maxed out and I race at. http://www.rcracephotos.com/special/westcoast3.html
To the left of where the camerra starts is the jump, you just can't really see it, because of the angle.
This track is clay, and was built for electric 1/10th buggies and trucks, then E-maxxes came along. It's a good track, even for the E-maxxes, but if your building it only for monster trucks probably go for more of a 1/8 style track. And since your not bringing dirt in I guess you probably won't be using clay. Sorry I don't have any 1/8 track pictures though.