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ArmA Edit and the game editor. That should cover most of your editing needs. Place your units and waypoints in the game editor. Then you can polish off your mission with ArmA Edit (scripts, briefing, overview, weapon selection).
It's a bit overwhelming at first but people have asked about some good tutorials so start with those. Create a simple mission at first then start something more complicated for your second mission.
In ArmA2 they have a system where you type in the command, and when you highlight it, it tells you what it does and where/how you use it. Neat!
I've always wanted to do camera scripting for movie making, but you need to control units through scripts which can be very tedious... For this, you can try go to www.ofpmm.info, they could help with mission scripting too.