For a 3" locust I'd cut it to length, finding the best section of the trunk, split it in half, lengthwise. If you are sure the tree didn't grow in a spiral sawing is an option too. After the pole has been halved bind the 2 halves together with small wood spacers between then for good air circulation and set it aside for a few months to dry. This will keep both halves from twisting while drying and from taking too much reflex.
You could cut each half to floor tiller stage before binding them together for a drying period. If you have access to lumber you could make forms to bind the halves to that would help prevent twisting but you could add controlled reflex while drying.
Don't remove the bark yet. Once the staves have dried the bark should come off fairly easily being that you harvested the wood during the early growing season. Be sure to seal the ends of the staves. Wax, paint, shellac, varnish, wood glue will all do the sealing job.
You won't have much heartwood so build the bow with the sapwood. If the bark removes easily use what's under it for your back.