Glad to hear it! Have you tried the demo yet? Might give you a slightly better idea of the game.
In general you follow the story of Sam as he moves in with Michael, this first game is about the things that transpire during the first few days of staying with Michael. There really is one main linear storyline with small off-shoots and changes based on your decisions, not whole separate routes.
There is no real dating anyone yet in this game. So he will still be single by the end, as the game takes place over just a few days.
The game does not feature any timed choices.
Hopefully that answers all your questions but please let me know if you have any others!