The average high sale price for your autographed Apollo 11 photo is $350 - $450.
Here is a link for you to comparable examples:
Sold for $360:
Sold for $449:
As for your other NASA Space Program related ephemera, I generally only handle one item per question here. I do recommend contacting Heritage Auctions as they do have specific auctions that feature space program collectibles. It is free to contact them through their website at www.ha.com
You can also list these on Ebay, and yes, there is a collector niche for these items.