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Jon & JenniferOnce a card has been damaged (ripped, stained, torn, water damage, crinkled, creased, smudged, etc.), there isn't any way to "restore" it. Attempting to "fix" a damaged card (by recoloring or trimming) would be a bad idea. Rather than increase the value, the card would be considered "altered" -- the virtual kiss of death for a card in the eyes of most buyers & collectors.
Once you have a better handle on the year/issue/players you have, you can try to guestimate what each card might be worth in its present condition (various websites and publications publish price guides for trading cards, which are categorized by year, issuing company, card number/player, and the price based upon its condition or grade. (PSA: www.psacard.com, SGC: sgccard.com, Beckett (does not offer a free online priceguide, but their yearly publications are sold everywhere.)
As far as preserving the cards from this point forward, a good place to start would be putting the cards into top-loading plastic "card saver" sleeves; they're a quick and inexpensive way to store and protect the cards from any further damage. (Sold by the box in various sizes, and readily available on the internet.)
Hope this helps...good luck!