1. If you can get second level, you're better off. Especially because the "Sport Chek Zone" (part of the 3rd level) is General Admission.
The sightlines in the Saddledome are all really good though. Whereever you sit, you'll be able to see the game well.
2. The C Train stop for the Saddledome is Victoria Stampede. There's a walk of a few minutes to/from the Saddledome. Interesting fact: you go through part of the Corral (the old building where the Flames used to play in the early 80's). You are much better off taking the C Train to the game than driving.
3. Being that you're not from here, I highly recommend a walk down 17th Avenue after the game. It was coined "the Red Mile" during the 2004 playoffs. There is a bar/restaurant on 17th called The Melrose Cafe that was widely regarded as the epicenter of the Red Mile. That part of 17th is very close to the Saddldome- you can walk there, no problem.
Also, You will probably hear of a sports bar on 8th Ave. AKA Stephen Avenue called "Flames Central". This is a bar that used to be an old theater- the Flames ownership purchased it and converted it a few years ago. While it is quite a spectacle-lots of HDTVs, very nice to look around, it is also quite expensive. You might want to have a look inside, it's cool, but it isn't worthwhile to eat/drink there really.
I hope that helps, and I hope you enjoy Calgary!