The core rules assumes you have bought and played the board game so doesn’t spend a huge amount of detail on this - something I’ll have to rectify as this is more of a break out hit than I expected.
This Space Intentionally spends a lot more time on this. The launch pads chapter is designed to give you a feel for running some space missions as if you were playing the board game. The Missions chapter then outlines the process you’ll follow travelling from site to site.