Same here, started my medium prison a day or two ago. c: Lot better than the first 'cause it's less cramped, like you said, but also I have an idea of how things work in the game now lol.
Does selling your prison actually do anything, like do you get to use that money to start your new prison, or is it just like a game over? I didn't sell mine - when things started going bad (like my classroom spontaneously caught fire) I just got outta there, haha.