am I required to pay support after my child turns 19 and I still have one more that turns 19 in 2017

Excellent question. Under most circumstances, the answer is "yes." Absent a motion to modify child support, you will be required to pay the same amount of child support until the youngest is 19. HOWEVER, you have a right to request a modification of the child support you are currently paying and you should do that (in 2011), so that the court does a calculation for one child instead of two. Depending on your income and your ex's income, this will likely substantially decrease your child support obligation from 2011 -2017. If you don't do this, you will just be paying too much, but there will be no automatic adjustment. The second question about the child living outside the home is also a great question, but it cannot be answered with those facts alone. I think it is a question for a judge to decide based on the totality of the circumstances. I don't think it would cost you much to have an attorney represent you in this action in 2011 and I would strongly recommend that you get one.
Culver