Can someone please tell me where in the rulebook is explanation of system control?
what do I need to have in order to control it?
The answer you seek is on page 8 of the FAQ.
In order to control a system, you must control every planet in the system, and you must have at least one non-fighter ship in orbit. If there are no planets in the system, then you already control all zero planets for this purpose.
thanks for quick reply