You can get blueprints from friends or buy them with gold. During the game day (20 hours), you can accept no more than 20 blueprints. Friends can send you blueprints as a daily task (no more than 20 blueprints per day), as well as at your request directly (no more than five a day). A player cannot receive more than one blueprint from a friend.
You may buy ingame blueprints as well as hire additional workers with gold or from Smugglers base. Just select the Smugglers base and pay attention to last two slots.