In reply to Jayfaulkner:
Le prez in Grez-sur-loing might be hiring equipment, as I saw them making up some posters when I was there a month ago. Give them a ring, one of the owners is British.
The campsite is also excellent, although you'll need a car to get to the climbing areas. It never gets really busy in the summer and you can have a fire. Everyone in the village/ campsite swims a few minutes from the campsite entance.
*not promoting the place, but some years I set up camp for the entire summer.
Easy circuits are everywhere. Get a guide, find a yellow circuit and away you go. Closeish to the campsite is Petit Bois in Nemours which is also really shady. Otherwise go to the honeypot areas. Font is perfect for beginners.
Have fun.