I am a dnd dm who just picked it up. I am looking for a character sheet pdf that I can edit w/ my computer. ?

I have adobe reader 9.0 , but I am not sure if there is additional software required to edit pdfs. I am not sure what the exact problem is, I just know there are variouse character sheet pdf's I have downloaded and opend with adobe acrobate reader nine and I cannot edit them. so maybe it's the sheets that arn't in editable format or the program that isn't enouph.