1 Book Found

Based on your description:

"A kid moves to a new town. His fathers job is to be a clown. I remember that the kid had a curfew and he missed his curfew which led the kid to be stalked by someone i remember a black van, he becomes friends with his girl at school who takes him to a store to buy new clothes or something like that. The second book is two friends escape to go to a haunted mansion house kind of thing and to get there they get passed a gate, i think there was also a scene where they were at a graveyard and they could see the mansion from there"