Are these pokemon cards worth anything?

In 2010 my cousin gave me over 700 cards many of which were Japanese cards and 1st addition. They've sat under my bed ever since. I picked out the ones that sort of looked valuable and put them on a shoebox. If you could let me know if anything I have is valuable and how much they're worth or ones I should keep my eye out for that would be great! because I don't know much about pokemon cards. They seem like a cool market but hard to sell. Thank you for your time!

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