Tips and tricks on getting baby to sleep in bassinet?

Okay so this is our second night home and last night was horrible, I think he slept in his bassinet for two hours and then would not even attempt it after, When I’d put him in there, he’d immediately wake up so I basically got no sleep. I do not wanna cosleep and I’m doing my hardest to not but I’m a single mama and have no help so I’m struggling. Also I’m kind of terrified to put him in the bassinet because when he’s swaddled, he rolls over by himself (don’t ask me how) he did it at the hospital too and the nurse couldn’t even explain it so does anyone have any tricks to help get him to sleep in the bassinet? Cause I can’t keep going nights on 2 hours of sleep and no more.