Don't make a multiplayer cinematic, as DarkAngel said, no one will watch it in battle.net
Make it a single player cine, that way you can use a lot of custom models, skins and music as well. If you have just started making cinematics, then first make a normal cinematic with not too many fights in it. Then when you've got the hang of it, you can start making fight scenes as well and then you can start making cinematic series.