I like to have 3 to 4 construction yards in every sector. I like to defend them with three shield generators and one LNR or KDY V-150. If playing the computer, if one shield generator goes down your planet is still protected. You will have time to replace before the computer sends in ships to see if he can capture a weak planet. I also try to have three troop facilities on a planet per every other sector. As far as shipyards go, I try to have 6 or 7 on Coruscant if playing the Empire or the same for the Rebel headquarters. I am playing a large galaxy now as the Empire and my largest shipyard is located on Coruscant with 6 shipyards. On Uvena, I have 1 shipyard. Its task is to supply fighters to Coruscant. Coruscant supplys the big ships for the battles ahead. Next largest shipyard site has only three shipyards located three sectors away. It doesn't serve much of a purpose. The main hub is Coruscant. That is where my protection is needed most. If I capture a whole sector, I normally destroy all shipyards in the sector if playing the computer. I wouldn't recommend that if playing a human. As troopers go, I put 6 to 9 Stormtroopers or Darktroopers per planet until I capture the whole sector. Once I have a whole sector, I will go down to 3 troopers and 1 Imperial Army regiment or 6 Sullustan and 1 Army regiment. I normally have three to four fleets with the fourth fleet the weakest. I use it to take over planets on the outer rim. The first fleet which is pretty strong guards the headquarters. the second fleet which is my strongest is attacking enemy strongholds. The 3rd fleet is used for hit n run tactics. All of this changes if playing a human, because u can't predict their moves or intentions. Normally if I play the alliance, at first I will have 2 Dreadnaughts, 4 Nebulon-B Frigate, 2 Corellian gunships, 4 Escort carriers, and 4 Corvette. Mid-way thru game add 3 Mon Calamari and 2 more carriers, plus your CC-7700 Frigate. Towards the end my fleet will look something like this. 2 Dreadnaughts, 1 Cruiser, 4 Assault Frigate, 2 Bulwark Battlecruisers, 1 CC-7700 Frigate, 2 CC-9600 Frigate, 4 Corvette, 2 Gunships, 3 Dauntless, 3 Liberators, 2 Mon Calamari, 3 Nebulon-B, 7 Carriers. + over 130 fighter squadrans. Let the Empire shake as your fleet moves on.