There should be a series of missions to do on earth that give you blueprints to complete the components of your ship, if you haven't already. That might be a good place to start. Otherwise, work your way through the starchart and check the console across from your market for quests. There are several quests that dish out Blueprints for Frames that you've probably never seen.
There are now openworld levels on Earth and Venus. They might be tempting but you'll be overwhelmed if you try to jump into them right now.