This is why there are professional editors out there. We earn our living helping clients who don't know what they're doing get exactly what they want. If you really don't know how to do this, I'd suggest recommending to your boss that he hire one of the many professionals in your area to do the job.
There are lots of us out there who need the work.
Welcome to the forum.
There are a couple of choices for the Export, to keep it as closely X-platform, as is possible.
As most (but certainly not all) PC's have Apple's QuickTime Player (free from Apple), a MOV file, with an X-platform CODEC, like Animation, would be good, however in some corporate PC offices, there might well be a ban on installing ANY software, like QT Player.
Another choice would be MPEG, as both WMP (Windows Media Player - installed with Windows) can play most, and Apple's QT Player (installed with the MacOS) can also play them. Again, the use of an X-platform CODEC, like MPEG-2, would be wise.
A bit of the choice might depend on just who the clients are going to be, like the above mentioned PC's, where the user might well be limited to ONLY WMP.
Thank you for that link. That was going to be my next stop, but you saved me the work.