The goal is to make an easy and newb friendly one to three missions of a campaign. I got another map or two I'm currently working on, but I think this idea is worth entering the brain storming phase, and I'd like some feedback/additional ideas.
So far I'm thinking of a terran macro mission. Maybe have a simple respawnable hero unit with one ability. I'm thinking Tychus with shredder grenades.
A special building (maybe a special supply depot) with the following:
1. Periodically generates a small amount of resources. Can be upgraded a few times to produce more.
2. Periodically generates some free units. I'm thinking the defenders of man soldiers that were basically marines. They wouldn't be affected by armor/attack upgrades. And maybe I'd reduce their attack range by one. Each soldier would automatically train one at a time up to a max number per depot. The depot would start only being able to support one free soldier, but could be upgraded individually you support up to 5 free soldiers.
These depots would be limited to like 4 per mission. Not sure if they all would be pre-placed (and invulnerable), or if you would begin with like 2 and then be able to build two more.
The free units would be nice because the new player could move out with them with little risk. They'd also have something to defend their base if they hadn't built any defenses.
Enemy attack waves would be weak...
Might give the marines/marauders/etc an extra point of armor for the player. Just to make things easier.
In addition to the supply depots generating resources (they would generate at a relatively slow rate), there would be 3-4 mineral fields and one geyser at starting base. Probably an expansion.
Maybe get rid of the tech lab, and add barracks upgrades to engineering bay. No tech lab needed for marauders/etc.
Probably make it playable as either 1 or 2 players. So people well versed in sc2 already could potentially get their friends to it. So two bases near each other at start. Extra command center for second player, or empty if no second player. Could start with four of the special supply depots, and they get split between the players.
Maybe just auto give 100 supply, and make it the max.
As for story... those Protoss jerks are trying to run us away from our land and steal our crops on Agria etc etc...