Thank you for the responses everyone! They are appreciated. :)
As I said, I'm more or less clueless on what Endurance riding takes. I'm aware that competing seriously is a bit further in the future (if there at all).
I'm still in the beginning stages of learning and would need a far better feel for the sport of endurance and far more miles in the saddle simply riding before I make any commitments.
Volunteering is an excellent idea! I'll ask the couple I met about any volunteering opportunities they might know of. Endurance isn't typically huge right in my area so they are probably the best people to point me in the right direction.
The QH I'll be leasing might not be for speed but I'm sure we can train to finish, starting with limited distance. That's a much more reachable goal for us. :)