Joined the crew today and added everyone also.
So far I was mostly getting race wins for all the racing upgrades, some heists or something else would be nice for a change.
For some extra money remember to do the 3 daily objectives that you can find in the Interaction Menu (M) once you're rank 15.
You get $25k each day for it, and on top of that for every consecutive 7 days you do it you get $100k bonus, and for consecutive 28 days you get $500k bonus, so over the month it adds up to like 1.6 mil.