Welcome. You'll find a lot of support here. I would recommend the book Opening Up: a Guide to Creating and Sustaining Open Relationships by Tristan Taormino. There's also website associated with it: http://openingup.net/
. I haven't explored it much yet, but I'm going to now that I know about it.
It's about all types of open relationships, not just polyamory. But it's a good source of information.