You could try your luck with component files and git, but from my personal experience, it is better to just upload the mapfile with the newest changes somewhere like Google Drive, and your teammates download that version, and then they work on it and upload the newest version as well.
It's cumbersome, but it prevents all of the technical issues that can come up when working with component files.
In either case, communication is key. Any technical issues can be overcome if you talk to your teammates often.
oh ok...I guessing the battle.net one is not up yet?
and quick question...when I use the downloaded version I only see in the units tab the UED Valkyie. is this normal
Yes, that is normal. There is a trigger included in the mod you're meant to copy&paste into your map. That trigger changes the models of all your units and structures automatically, if you've selected UED as your race (under player settings, change it to UED).
The Valkyrie unit doesn't exist in default StarCraft II, that's why extra unit and weapon data was created for it.