Anime-Beta TNG

I have a bunch of cels from 90s anime’s (mostly Tenchi) that I’d like to sell some of, a bunch of other anime memorabilia I picked up in Japan as well. Trouble is I have no idea how to value this stuff. Is there a fancy area of the internet to get assistance on this? Hell it may even be here but I didn’t want to break any rules

Your best bet for getting a starting point would be to check out what cels/sketches from the series you have are going for or at least the asking price.
Look at Yahoo Japan auctions , Ebay as well as a few cel dealers sites.
Good Luck