I will try and make this simple because I have worked with a few models before :-)
the best advice I can give is give them the same respect you would give your mom and you will be fine :-)

also from talking with different models the kind of photographers they try and avoid are what they call MWC  (man with camera) and thats guys that have simple point and click cameras and no real gear to speak of. so make sure you have DSLR or SLR camera because they look at that stuff as well to make sure you are serious.

and most will work for TFP ( trade for pictures) or TFCD (Trade for CD of pictures) but they really have to like your work to want to do it for a trade :-)

and also make it real clear that they are welcome to bring a friend or escort. this will make them feel safe and over time as they get use to working with you they will just show up on their own.

and all models I have worked with already know the limit they will shoot at some are ok with nudes some are not. they will tell you the limits they have. and you work within those limits.

Models can be fun to work with so dont have a fear of it :-)

the biggest fear I have with models is most never show up when they say they will. if they do show up at all they are always late for the shoot.
and that should be your only fear with models. the pure fact that you are asking how to do this the right way tells us all you already have respect for them. so you have that part beat already so dont worry :-) and have fun with it :-)
Miranda