I just need to find out the value of these cards for my boys:

Javy Lopez Upper deck first pitch
Kevin Millwood topps 405
John Russell DonRuss 90
Joe Boever topps 627
Phil Niekro donruss 82
John Smoltz/P upper deck 44
Tommy Greene 09'score 1990 Rookie
Ryan Klesko Score Select Rookie Prospect
Adam LaRoche Topps first base
Francisco Cabrera topps 40 years of baseball
Dale Murphy donruss '85
Greg Maddux, vintage upper deck

Sorry for all these questions but I need some help.
Thank you in advance:)

If you look down at the bottom of this page, you will see links to questions that have been similar to yours. If you check out the links, you will be likely to find answers that will help you to find the information that you need.

The value of the cards does depend on the condition that they are in.

Here are some other links for you.

Baseball Card Value Price Guide | Selling Baseball Cards

CollectSports - Baseball Card Price Guide, Sports Cards, Auctions, Collectibles, Trading Cards, Football Cards, Basketball Cards, Hockey Cards

Also, if you go to a bookstore, you will probably find books concerning the pricing of baseball cards.