mx4, if you battle with the second question, here's an easy way of remembering how to set up the OBS to intercept a radial.
I always teach FROM -> top TO -> bottom. Meaning:
If you intercept a radial to fly FROM a station, then the radial you wish to intercept must be on the TOP of the OBS, and a FROM indication must be showing.
If you wish to intercept a radial TO a station, then the radial ou wish to intercept must be set on the BOTTOM of the obs... i.e set the reciprocal on the top of the obs, and a TO indication must be showing.
FROM TOP, TO BOTTOM.
Helped me!