Autohotkey really isn't that complicated, though. Most things that you want to do probably fall under the good ole programming law of looking it up because somebody else did it already, when it comes to AHK.
You can do a mapping to any of the standard multimedia keys. For you, that'd be something like:
$F10::Volume_Mute
$F11::Volume_Down
$F12::Volume_Up
...etc. for any of the F-keys and the standard multimedia commands. You can see the available list
here.
You can also choose a modifier key to press along with the F-key (e.g. ctrl+F12 = volume up) or you can toggle the mapping with scroll lock in case you don't want to lose the original functionality of the F-keys.
tl;dr what exactly do you want, it'll be easy to make.