^This
Let me add a thing, the AI isn't such complicate to understand, it's quite repetitive. Work on a "defensive wall" positioning vehicles where the enemy likes to strike.
The beginning of a mission is always the hardest part, once your defenses are ready and you have closed weak points you can start to annoy the enemy.
Remember to use a fast and expandable unit to explore the fog of war and locate the enemy, if you learn where they are you'll know where they come from
