The only thing I don’t miss about having a puppy is going through potty training! Yes, he’s still very young and accidents are to be expected. Two of my dogs took to bell training, my female did not! Every pup is different but you will learn to understand how they act when they need to go out. Keep him near you when he’s not in his crate. One thing I did that seemed to help is that when they woke from a nap, I’d say “do you want to potty or poopy?”, and then I’d take them right to door. When they did their business, I’d do the happy dance with a lot of “good boy/girl, going potty” praises, and a cookie to follow! Try to put a bell on the door and ring the bell before you open the door to let him out, and then after awhile make him ring the bell with his paw instead of you doing it. Don’t give up on it! Sometimes it takes awhile. But as training goes on and you see your pup asking to go out in a way other than using the bell, then he probably won’t ever want anything to do with it.
Good luck!