While you are talking to the printers, ask them questions about how they would like the masters laid out. Also talk to them about how they will be binding the catalog. They may be able to automatically staple one corner of the catalog during collating. While you are planning talk to the person who is handling advertising. Make sure you have agreements on when you are going to get all of the advertising that is going in the catalogs.
Spiral bindings are nice but significantly add to the catalog costs.
This binding is usually done by hand. Be sure you follow copyright restrictions. You are trying to make the catalog entertaining for the exhibitors and the visitors to the show so they will come back. You should provide a margin on the left side of your single sided originals to allow for staples or spiral bindings. Most of us hate to write into the binding.