I lost a lot of my muscle mass because I lost motivation and stopped lifting weights. I used to be a decent size in the past so that gives me assurance that I can get back to being big like before.
I hear it is harder the second time around to get into shape but you sound motivated! 
Maybe but from what I heard, you still have the muscle memory in your fibers to get big so it should be easier.
Really? Thats good to know because I had no idea. I wish you a lot of luck in regaining your muscles back! 