Really, how do you get nova as the most used resource? I thought it was food.
Melee units actually work well against Mechs, since they can get inside their minimum range, the best cure for Air Cruisers are Geonosian Warriors.
Seek out holocrons agressevly, espcially if you are Naboo or Republic.
Never slaughter Nerfs/Banthas, doing so will deny you (mostly) free food when you need it.
Always have a large Reseed Farm queue, this way you don't have to get distracted by rebuilding the farm.
If you can get to Tech Lvl 3 before everyone else, build an Airbase and build Fighters and Bombers before the other guys get there, if you do so, you might be able to damage them enough to make them resign.
Beware of TF rushes, the TF's lack of need for prefabs makes them dangerous because they have more carbon for troopers.
Always have a good air defense, especially against the Alliance, Naboo, Wookies, or Republic, all of these have a good air force and have lousy Mechs and Hvy Weapons, if they can't touch you from the air, then they'll have a hard time touching you.
Only attack when you have the edge, or else you'll be wasting resources.
Your five most critical buildings are the Troop Center, Command Center, Jedi Temple, Airbase, and Spaceport, Laser Troopers provide a decent base defense, and can be garissoned in turrets, Command Center lets you keep your economy growing, Jedi Temple provides Jedi for conversions/capturing holocrons, and lets you get nova from holocrons, Airbase is always useful regardless of the type of map, but especially on Team Asteroids. Spaceport lets you trade with allies, and use the nova gathered from holocrons to buy other much needed resources.
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