I've been a member on purestorm and model mayhem for over about 2 years in total. I joined predominantly to gain the same experience that the OP is looking for. However, it's not as simple as just joining, logging on and being able to get a model and would highlight the following:
1. Virtually all the Models will look at your portfolio before they decide to give you their
time for free - if you can't demonstrate that you can create the quality images they
would like to have for their portfolio, they will not give you their time for free.
2. New models only shoot TFCD as they need quality images for their own portfolios - so
the above point applies again.
3. To get any sort of result, you need to shoot in a studio with the right equipment and
either with the right assistance or after having had the right training.
4. It is vital that you learn how to set up and meter the lights correctly - if you don't
know how, it is well worth sigining up to one of Chris Burfoots Courses to learn how.
5. It is highly advisable to pay an experienced model to work with you initially in order
that you can create some quality images to start your portfolio. It's not as expensive
as you may think. Alternatively, attend a couple of Group Shoots or a Model Day at a
local Studio.
6. Don't give up. If you look at any of the sites, purestorm, model mayhem etc, you'll find
hundreds of photographers seeking TFCD work so it can often be hard to get.
7. Why not halve the cost of a studio shoot with an experienced photographer? You
could get a 4 hour studio slot with a great model for £80 each. You'll get some great
images and learn by watching the photographer set up.
I built my initial portfolio by hiring models and studio time. Once I had a strong portfolio I attracted TFCD and gained more experience: now take on only paid work. I've had 2 offers today, 6 last week. unfortunately, you are going to have to invest some money if you wish to learn about about creating such images successfully.
I shoot mainly at the Adrian Pini Studio at Staples Corner, London. I regularly share studio time with those who wish to learn or just gain experience - if you'd like to share costs and shoot or even pop along just to assist me set up, drop me a line. I'd be happy to help. I shoot weekly.
If enough of you wish to get together with me, I can price up a full day in the studio with a number of models and take you through some basic lighting setups so you'll get some quality images. The only cost will be for the studio time and the models, which between say 4 photographers may be no more than £100 each for the day.
www.paulstuntphotography.com