When I got into Randonneuring I found the FAQ (notes) of those Randonneurs and Randonneuses who rode this road before me extremely useful.
One of the first things you should to do is read the SIR and Randonneuring Email List Servers note, it tells you how to sign up for the SIR and Randon mailing lists. There is a wealth of information in both email groups.
Spend some time looking over the other FAQ's; whether it's SIR Brevet Rider Expectations, definitions of the strange terms we use, wool jersey care, or other tips and tricks you'll find all of this and more in these pages.
At the bottom of the page are additional categories for Randonneuring Equipment and PBP.
Welcome to Randonneuring, we'll see you on the road!!!