1.Only Alliance air has got CRJ 700 (3) and jetlite is replacing its CRJ200 with ATR....i hope this answers clears a little doubt.
2.No you can not do TR from India...best place ummmmm depends what you are looking for...
3.Cost would be around 15000-18000euro/16000-22000$
4.You only need DGCA NOC....no exams considering you will do your TR from outside of India.
All the Best.