I am a viola player who just ot a violin and I have a few questions.\
A) Does the violin stay in Treble clef all the time. If so, how many ledger lines below the staff is open G?

Thanks

All violin music will be written in treble clef, since the lowest note it can hit, open G, is only the fifth note down. It goes D, C, B, A, G, where C is middle C.

This site...
http://www.violinonline.com/fingeringchart.htm
will give you an idea where the notes are.
Have fun with fiddling!
Katie
http://www.folkfiddle.com