First of all, if you want to know how much of each product you should use, it´s a good idea to test them by themselves first, as described here: How to find your sweet spot...
This post by StevO is already a classic.
The following are some of the threads that got me started. You can find all of them as stickies in the men´s section, by the way.
Also, the search function is really useful once you have started using a product. You can search for it in titles of threads and see what other users have experimented.
Theres also a ton of great info in users jurnals. Once you start reading about productts, you will realize that there are certain users whos reprts you happen to enjoy more, so it´s a good ide to look for their journals, suscribe to them and paticipate in their conversations.