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DJPricing autographs is always tricky and it is not an exact science because there are so many factors you have to deal with.
Is it for a forgery? That's the most important thing. Is it authenticated? By whom? When was it signed? What is it signed on? How is the item is it signed on? What writing instrument was used? What is the contrast of the item? Is it personalized? Provenance? What's the overall grade of the signature and the piece? etc.
A signature can get $500 from auction house A and that same signature can be sent to auction house B and get $1500. Basically, guides can give you a rather inconsistent range, therfore are useless. As far as your requests go:
Ty Cobb Check $800-900
Hoyt Wilhem Check $30-40
Babe Ruth Photo $3,000-4,000
Rabbit Maranville Photo $700-800
Hope that helps a little.
DJ