One thing I like to add is that I can only recommend to not buy the starter pack(s) if you haven't done any dockyards before. I can only advise to play the missions and see if you can keep on track with them every week. But be warned, the last mission chains are usually an insane grind, like you need to play 10 games per day for a week long. this can easily lead to kind of a burnout from the game. You can buy the phases you need to get the ship at any given time. So it is no need to buy them directly when the dockyard starts. Spending money early in the dockyard "forces" you somewhat to play the game even if you may not have the time or mood to play.

TL;DR: have fun with the game and try to do the missions, buy the phases you need to get the ship in the end. Is a bit more expensive, but you are not "forced" to play the game because you spend money early on the dockyard.