[planetalcatraz]

For me, better have a completed team first, then do the sub quest. Four people in a team can make mission easier, especially when you get minimum 1 full T jacket, it's very strong armor (like ironman or robocop in the movie).
Some mission, like thief in the warehouse, next to Blacky's office, is not available after we are advance in a main quest. so better to start(initiate & display on a log) all the sub quest, before you followed the main quest. sub quest can be found when talking to NPC (yellow dot on a map).
To get all member's team, follow blacky's quest & finish all human encounter on a global map (no need to finish non-human encounter).