You just have to do the Kifflom Missions you'll get.
- First some Missions where you have to just make Donations
- After that you have to Steal 5 Cars, 3 can be bought
- After that you'll get a Mission where you need to find something
- Then you need to buy the Epsilon Robe ($25k) and wear it for 10 Days, you can sleep to speed it up
- After that you have to Run in a specific spot for 5 miles and then pay some money again