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.
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