The Punishers probably aren't worth a whole lot these days, but a few of the War Journals might be. They feature some early Jim Lee art. You can take a look over at ComicsPriceGuide.com. It doesn't seem to be too far off base, as long as you ignore the CGC bullshit. Looks like those Punishers aren't worth much anymore. Too bad. They used to be way expensive.

Anyway, most stores these days seem to use either Wizard prices or Overstreet prices, usually just Overstreet for things Wizard doesn't list. Wizard will list all the ones you have, though. Go to a store (most big bookstores seem to carry Wizard these days) and pick up the latest issue. It'll only cost you a few bucks. Or look at it in the store, since you have a discrete few things to look at.

Of course, there's still the issue of grading the books. If you're not interested in them anymore at all, just call up your local shop and ask them if they're interested and how they would like to have them presented. Some shops would like a list just to see if they care at all; other shops will want you to bring them in so that they can judge their condition.