Personally I've never been overly impressed with the Auto-Glym products I've used, so wouldn't recommend their kit myself. As MP has said, Swissvax do some kits, their products are VERY good, but may be a bit pricey.
If it were me, I'd probably start building up my own kit of basics (2 buckets, decent wash mitt, decent shampoo, a few mircofibres and some quick detailer - Or, you could get the Megiures Clay Kit which will give you a decent clay bar and some quick detailer). From there I'd look in to buying a tester pot(s). CleanYourCar have a great range of Dodo Juice pots for £6, and also tend to carry small cheap pots of Iron X etc. They will last you a good few cleans and then you can see how your getting along. You might find its not for you, or that you are really in to it and then you can invest more time and money in to a large pot of a quality product.
The one thing I would say is that detailing is one hell of a money pit if you get carried away and if you're just getting started don't get talked in to forking out a fortune on large amounts of the latest trend product, only to find its not for you.