In my opinion, to retire from something, you need to be doing that thing for a while and done so much so that at some point you don't feel like doing it or don't need to depend on it for livelihood (e.g. work).
So eh, to retire from paid sex, you need to get enough of it first?
Since you say you're a newbie, it's TOO early for you to talk about retiring lah...
p.s. I got database error when opening the last page of that PRC - help help help thread leh...izit me alone? sianz... so jio another new thread now