This will improve your chances of finding missions to run, and also the amount of time you have to infiltrate those missions. Do not do that yet, instead, go to your home region and scan there. That takes you to the main map, where you will see the option to scan for the Blackmarket. When you are done with all that you can go to the Bridge with the cool holo globe.
Switch all the Personnel to Intel gathering and assign a Haven Advisor (I find a Ranger or Assault work best early). This will open a screen that lists the Haven advisor and all the Resistance Personnel. Go to the Commander’s Quarters (upper right corner of the ship), select “Resistance Management” then click on the single haven listed. Start building the Guerilla Tactics School in the one vacant room. It will prompt you to promote all your surviving soldiers. It will prompt you to select a Technology choose Modular Weapons. After the battle you will be introduced to the Avenger, your ship and also your base. If lose more than one soldier, you may want to turn down the difficulty. The game opens with a battle, and this is a good test of your abilities.