shocks need to be bled I think..check the instructions for that
as far as gear mesh,
1. loosen the motor mount (dont' take it out, loosen the screws),
2. place a piece of paper btw the clutch bell and spur,
3. squeeze the spur and clutchbell together (which would mean move the engine to the spur),
4. tighten the screws down.
5.rotate the spur to take the paper out, and it should have a "steps" look to them (from being btw the gears). and you gear mesh should be set.
To check, hold the cluthcbell with your thumb and try to move the spur gear, there should be jsut a "tick" of movement (you shold only be able to move it really slightly).
one last thing: THREAD LOCK the motor mount screws!! to do this, take one out, dab it with blue threadlock, screw it back in, repeat with the other screws one at a time, and do in in a criss-cross pattern (upper left, then lower right, then lower left, then upper right). This keeps the mesh and evens out the pressure of you screwing the screws in, keeps things "square".
Hope this helps