http://www.rc10b4.com/forum/showthread.php?t=32
That'll be the best source for setups and information.
Basic idea with inline axles is that it will make steering much more aggressive. Most of the time it's just best to stick with trailing axles. (how the car comes).
Basically if you look at your currenct front axle, the vertical kingpin goes in front of the axle. With Inline axles, the vertical kingpin actually goes through the axle. You'll need the inline sterring blocks, and inline axle to make the switch.
Good luck.
Paul