The quick answer is the same for each faction:
- Land Factory, queue up 5-10 engies right off, then a mix of scouts, light assault bots, and tanks to start harassing the enemy.
- 2 Power Generators, adjacent to the factory for the adjacency bonus
- 2 Mass Extractors
- 2 Power Generators
- 2 Mass Extractors
- Another factory.
Send out the first engie on patrol to reclaim rocks and trees.
Build a hydrocarbon next if available.
As soon as you have extra mass, upgrade a mass extractor to T2. (I always forget about this, and it always kills)
And remember the number one rule: Never, ever run out of energy.
Here's a good overall introduction for new players.