Welcome to our forum.
Have you read the book "Opening Up
" yet? If not, I recommend it, it has a lot of helpful perspective and advice. Perhaps there's a local poly group somewhere in your area; you could google "Pennsylvania polyamory" and see if anything turns up.
What are your plans? How do you plan to get started in the poly lifestyle? What will you do first? I ask because it will help give me a better idea of what advice to give.
I recommend doing a lot of communicating. Communication is of utmost importance in polyamory. Keep on exploring the various threads in this site, and post any thoughts, questions, or concerns you may have.
Glad you could join us.