Jeeze....

As Frost suggested for ONROAD driving use front shocks in front and the rear. This will lower the ride height. For onroad driving use a heavy weight oil, with soft springs.

When offroading, use the standard front shocks and the standard rear shocks, usually 30-40 weight oil is a good place to start. I'd run silver in the front and green in the back to start with. ICT likes really stiff suspension for some reason so he uses red in the back, but he's just a basher

Mostly its trial and error, nobody can set up your suspension except yourself, but as for actually shock bodies, the ones frost suggested for onroad driving will work well for onroad, and the standard ones for offroad.

Oh and there isn't a difference in the blue shocks and the grey shocks besides the color. Just make sure you get the hard anodized shocks because they're better.