General
Here's what you want to do. Go to yahoo.com and do a search for "travel directions."
For starting point use Madison TN. Destination 1200 Broadway Nashville TN I presume you will be coming down I-65 so pick up the directions at that point.
This will bring you into downtown Nashville. Continue on Broadway to about 4th ave. At this point find a place to park (anywhere starting at 8th ave is okay to park if you don't mind a short walk).
Walk down to second ave. and go into The Wildhorse Saloon. They have a great pre-game party, no cover charge.
You can buy a ticket for the shuttle ($3) but I recommend walking over to the stadium. There is a new pedestrian bridge just opened and some beautiful views of The Cumberland river and the Nashville skyline.
Buy your tickets just outside the stadium. Should be able to get good field level seats for face value or less. Print out a stadium seating chart before you go and take that with you.
Try to buy your tickets from an individual and not a scalper. Ticket scalping is legal in TN so you don't have that to worry about. Price will be much lower from individuals, however.
Any other questions, let me know.
VVV