Freewheel hub bodies are a single piece, so there's not really anything you can be missing other than some stuff that threads on to the axle.

Spacers and Locknuts come into the picture once you've got the axle installed in the hub with the bearings in place.

For now concentrate on getting the axle in the hub. Aside from the hub You need 3 parts.

1. The Axle
2. Bearings
3. Axle Cones

I have a funny feeling you might be without axle cones....They thread on to the axle and provide the other surface that the bearings roll on.

This picture shows the parts that go on the axle. What are you missing? The dust cap is an optional piece.