There's a lot that could be done. A Beginner's guide video to warcraft2 with th placement, discussing resource starting conditions, nate formation, build order, tech tree, towering and anti towering, scouting, water, hotkeys, rushing and ani rush, and mouse settings. I bought a mouse specifically for war2 so i wouldnt use the touchpad on my laptop and it's still a bit rough.
then a tips and tricks video bugs, cat wars, juggernaught wars, etc(part 2 essentally)
then have a video for the important maps, gow, chop, etc.
Then use social media (Are you a wowt fan? checkout war2) and encourage people that already play to welcome newbs.