Research , research , research , research all ships , research up to lvl 20 Commercial (Terran) , lvl 2 Housing , Planet Cluster lvl 1 , 2 , and 3 , and finally Capsule Lab . Build up your Credits to maintain your fleet Upkeep ( additional cost after ships are bought . ) Think two ways Defense and Offense , Offensive attacks have high range and weapons whereas Defensive posture relies on High Hull and Low Upkeep .
How to fight ,(1) select Ranking at top of screen , (2) then Rank near me on left side of screen , then look for Attack to the right of a players empire and the Power Rating , (3) select Command at top of screen , (4) select Build Ships on left side , (5) Build ( buy ) your fleet to within 30% over the empire you intend to attack. (6) select Attack on left side of screen , (7) select Brows on attack screen or type in the empire`s number or name , then attack . Make sure you have the necessary turns to build your fleet and attack ( normally 5 turns ) and plunder / cluster / improve your new planets and reinforce your Defending fleet .
I`m sure DrunkenMasters could explain / shorten the process much better than I have done but thats how you fight ( the long form ) in GC.
Just a random thought..................zzzzzzzzzzzzzzz