Need help on a 1988 r30 1ton

[1971c10La]

I have a 1988 r30 1ton chevy dually and I changed the front rotor out and when I thightin the hub nut?? For the rotor it wants to lock the wheel so it don't spin so I missing something but idk what what I have is from inside to out is inner wheel bearing with seal then outer bearing a washer with a slot that goes on the spindle?? And the nut to tightin and a cutter pin to keep it from backing off witch is the only thing holding my wheel on so please help any help you can give me thanks #savemychevy