the hobos are in the bottom right of the slums, right under the don's area. You also should get the help of Lin-Lin who works in the Massage area.
Okay, now I managed to get Arlene, the Hobos, Fawn, Sammy, and Lin Lin for help. However, whenever I beat the Don, no matter what way I go about it, I always get an 'ending.' The game specifies I don't really have a plan for what happens after I beat him. What do I do about that? How exactly do I get said 'plan?'