With how things are going in EWR/LGA (new base and growing), you would have a line in your first complete month after your training. JFK is E145 only and unlikely you'd get it at this point. Long-call is 10% across the whole E170 fleet, but no guarantees which bases will get it in a given month. Proffering for trips is a new term for me, so you'll have to explain before I could answer that.