Following the previous mission, your journal will be updated with 4 dossiers (more if you have picked up additional downloadable content) that will enlighten you as to where to find some crazy individuals to join your team. From the map room in the Normandy, activate the galaxy map and set a course for Omega first. You will be able to pick up two of your squad members here (three if you have the Zaeed DLC mentioned earlier). As you land you will be forced into a short conversation and be asked to pay a visit to Aria T’Loak in the night club Afterlife.
Note: if you have the Zaeed DLC installed you will see him at the end of the hallway here; simply have a chat with him and agree to help with his mission and he’ll join your command and await you in the Normandy.
Look at your map and use it to make your way to the Aria marker. When you arrive, talk with Aria and ask her questions about Archangel and Professor Solus and she will tell you how to reach both of them. After the conversation, its time to get recruiting!