Find these hints useful while playing the game!
Playing in Galactic Conquest mode:
1. Keep every planet under your control.
2. On the ground make a barracks and a light factory.
3. Don't leave a planet without any guard either in space or on land.
Try to complete all the missions you have to. Wait for a while to get credits and Imperial Star Destroyers. If planets start revolting to your side, create a Space Station and Barracks at the same time.When an enemy ship enters the system, it will cancel the Space Station, but you will have the Barracks. After this, keep upgrading the Space Station and build a Light Factory and two Storm Troopers for every AT-ST or TIE Mauler. The Storm Troopers must be built first.
Empire space fleet: Build as many Accumulator Assult Ships and Victory Star Destroyers as it's possible for you. Use some Imperial Star Destroyers and an Interdictor Star Destroyer. After you have your space forces, pay attention to your infantry. Buy some of the first two things you can (Storm Troopers or Scout Troopers), then tanks.
Rebel space fleet: Build at as many places as you can, X-Wings for space and Infantry Platoons or Plex Soldiers for land. X-Wings won't have troubles ripping apart enemies. When the space battle is over, take the ground with your forces.
To get money: Conquer all the planets and fortify those which are around your mission planet. Then set the game to fast forward and run it. Make sure that you haven't been attacked. Now check your cash flow. You can return to a normal play and complete the scenario if it's ok. If not, just wait and let your money build.