In OP there is a link to a cheat mod (I haven't tried it so I can't give any feedback on it). As for walkthrough, everything is listed in game for the most part. I'm not sure if there is a proper walkthrough, but the game itself doesn't really have anything missable (unless you aren't a panty thief). For any events you can't figure out, just ask and someone will probably be pretty quick to answer. General rule of thumb is if you aren't sure what to do next, grind out a few missions to get the money you need to advance stats further, or talk with people in each of the rooms they show up in during various times of day. Use laptop to check store for interesting items. Remember to double check all types of missions as there are a few non-standard missions that will gate you until you do them (promotion and wine theft being only ones I remember).
As for Beuller, he's hiding after insulting the DeLuca family in Luna's presence. She didn't have any ice cream at the time...