The key thing to remember when working with models is you must treat them with respect and praise them constantly. If you're quiet, they don't know what you're doing or if what they're doing is right or wrong. When shooting models with my speed graphic, I've discovered it's best to praise the model and tell them somewhat what you're doing or at least say "one more!" or "just a few seconds more, you're doing great!"
I've been eyeing up models on artmod.org... they're better for slow working photographers. I have worked with a model that is more used to digital and they move around a lot more since that's what digi shooters seem to want, a new pose every 2 seconds
Remember to get them to sign a release form.
Expect to pay between ?12-?20/hour for a very good model and even at 2-3 hours, that time flies by. You should offer an at least 10 minute (paid, inc in per hour pay) break per hour of working/posing. Go for an experienced model if you don't have any set ideas and are not comfortable trying to get people into poses and positions you want. I've really only worked with experienced models hired by other photographers.
Sometimes models will do "TFP/TFCD" which stands for Time for Prints or Time for CD. They're looking to build a portfolio to promote themselves, basically. This may or may not work out well for you personally if you're not shooting digital along side or making weird prints like I do (cyanotype), which is why I nearly forgot to mention it.
uh I think that's all my limited advice for my two times I've taken photos with a nude model.
As far as the speedgraphic, quite a lot of these are contact prints from the 1912 Top Handle Speedgraphic that I use
http://www.flickr.com/photos/fishies_go_pook/sets/72157600504498156/I don't print them as B&W usually. I have really only printed two as contact prints in B&W
http://www.flickr.com/photos/fishies_go_pook/2516825002/http://www.flickr.com/photos/fishies_go_pook/2515802873/
