Zowie! Hi there. I am sorry that I didn't see your post sooner. WELCOME to APF. You should find what you are looking for. There should be plenty of people here to help you with your framing questions as well as dealers who can help with your poster quests---or perhaps point you in the right direction. Another new member wanted info and Thierry (aka eatbrie aka one of the owners of the site) made these excellent suggestions: "I would suggest someone like Dale Dilts on Ebay (
https://www.ebay.com/sch/m.html?_ipg=50&_ssn=ddilts399&_sop=10 or auctioneers like Emovieposter.com and HA.com. The last 2 have weekly or semi weekly sales." There are people selling FAKE posters (reprints being sold as originals) out there. There's discussion on these pages about sellers to watch out for. Be on your guard. But mostly, welcome and have fun poking around.
CHEERS!