First let me say that without pictures, and few details, it is difficult to say with accuracy, but if a guess is what your after then here goes, and as ifearyeti said, I have not noted autographs getting premium prices on most items.
About three months back, I won an auction for a complete
OCE Set with a fair condition box with Gary Gygax's autograph inside each book, on the front of the reference sheets and inside each of three seperate supplement books in the same listing (The listing also included a 3rd Edition Chainmail that was not autographed), All for less than half what some recent sales of
OCE's alone have gone for. I paid $148, or so for the lot. The
OCE books were in very good condition and the Supplements were all in Very Nice condition as was the Chainmail.
OD&D Booklets (No Box) with moderate to heavy wear will not likely get over $45 if sold together, if that much. Listed individually (separately), they may get as much as $15-20 each, depending on condition of course.
BTW: You did not mention whether or not you have the reference sheets. If they are in good shape, they could get around $20 from an astute collector who is missing them from his/her own set.
Your ‘badly worn' Greyhawk with water damage may not get any bids. They are too common for anyone to want one that is extensively marred and/or damaged by water. At best if you get lucky and someone new to E-Bay bids, then perhaps $10-15?
GD&H, would get perhaps $25-30.
The newer prints of Eldritch Wizardry tend to get more than the others do; perhaps it is the lady on the cover. Likely $25-30 in good condition, and up to $40 or even more if near mint.
Chainmail you already said what it will get, and gave no details as to condition, so that's it.