Card Identification Forum

I was given a 1990 Bowman set of lithographs autographed and numbered by artist Craig Pursley.  I have set number 62 of 500.  I have all lithos in mint condition in original package including the letter from Topps.  I am reaching out to you guys and asking for value and if there is a demand for this.  I also have most of the cards that were the entry forms.  Thank you in advance for any input I receive.  Also, any advice on how to sell these would be appreciated too, or just any advice you can give.