you need to know what size nipples you have. once you do you can but spoke wrenches from a bikeshop/online.
BUT straightening your wheels wont straighten your rotors...2 separate things. you have to carefully bend the rotor straight
http://www.hayesdiscbrake.com/support_downloads.shtml
look there for the manual to your brakes....sounds like you just need to make sure the pistons are pushed in and bleed the brakes.