I am new here, and not so much a dedicated autograph collector as a collector of paper - books, magazines - generally known as books and ephemera.  Sometimes, these items have signatures on them, and they add to my interest in the item.  In this instance, I have a Playbill for the Broadway production of Biloxi Blues that has several signatures on it.  I know that individually, the Playbill itself is collectable as are each of the autographs.  But it seems that the amalgamation of all into one document might make it of greater value than the sum of it's parts.

I guess I am looking for advice on how to go about determining a value.  Here's what I know:

The Playbill is for Biloxi Blues and is dated June 10, 1985.  Biloxi Blues is well known, and was also a movie, so it seems to be a bit above the run of the mill Broadway only productions.

It appears to have the autographs of several members of the cast next to their pictures in the Playbill, including:

Matthew Broderick, the lead

Penelope Ann Miller

Matt Mulhern

Geoffrey Sharp

On the back is the autograph of Neil Simon and three others that I can't decipher.  Looks like something like

Gene Maly or Baly

Richard Salzen

John V something

On the cover is another undecipherable autograph that says "Love - Don't Cry and then a scribble of a signature.

I picked this Playbill up at an estate sale in Sarasota Florida, a locale known for it's arts involvement as well as wealth, so I have every reason to believe that these are authentic autographs.

Would anyone have any advice on how I should be dealing with this?  Any idea that it may be valuable enough to invest in authentication?  Any input appreciated!