Answers to both your questions are in the Wiki at the top of this thread. I've reproduced the relevant parts for you below.
Originally Posted by
kjm12898
1) Can I put a reservation on hold online, call AA and tell them I want to use a paper voucher and then go to the airport to have it ticketed? I want to put something on hold tomorrow, and then while I am at JFK next week have it applied then, would that be ok?
Q. How do I apply vouchers to a reservation I have on hold on AA.com?
1) Call Web Services at 1-800-222-2377 or 1-918-832-1384 (6:00 a.m. - 2:00 a.m. CT, 7 days a week). In the UK, call 08-45-601-0619, 8:30 a.m. - 5:00 p.m. UK time, Monday-Friday.
2) Give them the PNR and tell them you would like to apply vouchers.
3) They will give you instructions on how to send the vouchers in.
4) Pay any balance with a credit card.
In your case, make a booking and put it on hold then follow step 1 and 2 above. Then instead of mailing the voucher go to a ticketing office. You may be charged a fee if you're not EXP. If you're not in a rush mailing in the voucher is fine.
Originally Posted by
kjm12898
2) If I don't use the entire value, what happens? Am I issued a new one? Or do I use the same one, and it only shows the available balance to the agent?
"If the voucher exceeds the ticket cost an MCO will be issued for the difference as a residual indicating non-refundable and for American Airlines transportation only."