Best bet would be to start with each mod slowly and separately. I've had similar problems since buying the game a couple of weeks ago.
Unfortunately, there's tons of reading needed and lots of trial and error. Even when some addons are working they still raise error messages that can be ignored; however knowing which can be ignored is another guessing game :)
I'd start with CBA and load that, with no errors, then move onto ACE, then other ACE mods and do similar with all other mods.
Assuming you're running Arma2 and Operation Arrowhead the latest mods are good, otherwise some, such as CBA need careful handling.
Six updater is a good place to start although not intuitive as it will keep some of the 'core' mods up to date.
Hope this helps some.