A bit of background first. When my daughter was about one we had a photoset of her taken by a professional photographer (http://www.desifontaine.co.uk/) . Since then, we've had a son and it's almost his first birthday. My wife would like some photos of him taken as well. I've been taking pictures of the children for the last 6-9 months and as I have got better, so my number of keepers has increased.
It's got to the point where my wife has suggested hiring a studio for a session to see if I can take some photos of the children. If this does not work out (she doesn't like the results) then we'll go the professional photographer route. I'm keen to give this a go, but am unsure about how to approach this and what to expect. Regarding equipment, do studios provide lighting/backdrops/etc as a matter of course? If they provide lighting, do I have to concern my self with syncing to the camera? I'm coming to this totally cold and have no idea what I’m letting myself in for.
I have a 350D, 70-200 2.8 IS L, 50 1.8, Sigma 24-70 2.8, Tokina 12-24, the kit lens and 550EX flash which should be more than enough.
The types of shot's I'd like to take are mainly portraiture, similar to those of Desi, and perhaps some "action" shots with props.
I’m based on the SW London area, so any recommendations would also be appreciated.