I use the Kepcor flash trigger that works really well.
http://www.speedgraphic.co.uk/prod.asp?i=6299&1=Kepcor+IR+Flash+Trigger On that modelling question. I work a lot with models who are not professionals and most of them are quite young. Had a shoot before Christmas with 44 models in one day, actually, in five hours to be precise and that was a tour de force. Okay, there were two longish breaks in between. There are few things:
1 - I only touch the models on the arms or on the back of the heads, brush hair out of the way and those things and only if I have to. Usually it's not important to have physical contact with them.
2 - Talking and making your models feel comfortable is very important. Most of the models are younger than me (yes, some could be my daughters), slimmer and probably prettier, too.
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They don't feel that I pose a threat to them and, to be honest, I wouldn't hesitate to be in the room with them on my own. Treat them the way you want to be treated yourself. (Okay, when I have a bloke in the studio I talk a lot of bull****). A photoshoot can be fun.
3 - Show them the pictures after you've taken a few. They will love it.
4 - Master your equipment. There's nothing worse to your own confidence and the model's if you're fiddling with camera settings, have problems triggering the flash, not getting the right exposure etc.
5 - I usually work without assistants. If I need a reflector, there's usually two spare hands coming from make-up.
Bettina