Country Line Dancing is just that, dancing in lines!  Dances are choreographed in patterns, that repeat.  Some dances are just to one wall, some 2 wall, and some 4 walls, repeating the patterns to each wall.

Nope!  Lots of people like to bring a friend or significant other to a class, which is great but line dancing is not partner dependent.  
Many people come to classes by themselves and meet new friends! I know I have!
 My very first classes I came to by myself, and I have met so many wonderful people!

Wear comfortable shoes or boots, with a low heel, and low tread, and leather soles or a dance sneaker. Stay away from shoes with a rubber sole that is made to grip the floor. You want to be able to pivot/swivel on the ball of your foot for turns.

The simple answer is No.  But you definitely can get a great amount of exercise!
You will get a ton of steps in and if you get a little more experienced dances you can work up quite a sweat. 

In general, the room has 4 walls (unless we are outside and then we pretend to have them). 
A 4 wall dance has a pattern that starts over at each of the 4 walls.
 A 2 wall dance the pattern starts over at the front and back walls.  
A one wall pattern always starts over the front (even if we turn during the pattern). 

This goes hand and hand with the wall question.  Think of the dance floor as a large clock and you start facing the wall that is 12 o'clock.  If you make a quarter turn right, you are facing 3 o'clock, then 6 o'
clock, then 9 o'clock, and back to 12. 

Yes, mostly! There are few exceptions to that rule with some crossover type songs and maybe some classic rock and roll songs.  I try to keep all my music upbeat and fun!
To be honest, I do not like to deviate too far from Country music in my classes with a lot of hip hop or Latin, because it isn't a Zumba class..lol.   I still love Zumba but I just like to keep it it separate.

Yes.  Please contact Robin for more info.

Yes, for anyone looking to hire me to teach a class or at an event I have insurance for my business.