We saw TNA tape twice last month.
Follow the instructions on the link above. Whenever you arrive at the Studios, head over to the right and visit the Studio Audience Center. This is where Lost and Found is. Tell the TM there that you want to see TNA that night and he will give you tickets for the number in your party. If this is handled the same as when we went you will be roughly lined up according to the numbers on your ticket. You will line up in front of the Rip Ride Rockit area. There are two lines, the VIP and Standby. Yours is the Standby. If you have any questions there are tons of TM's in the area a few hours before the show.
The facility is quite large and there are really no bad seats. I suggest working your way to the back part of the right side as you go in and sitting on the aisle on the left (as you face the top). That way if someone in front of you stands up, you can still see pretty well.