I am a white guy that speaks zero Chinese and I still get laid in the apartment buildings and small massage parlors for only 100 RMB.
I live in China now, please do not ruin it by paying too much.
In Shenzhen, start at the Sangri-la Hotel, if you are facing the hotel, go left, and walk down the road past McDonalds, the mamasans will find you and you negotiate prices using their calculator. They will then take you inside the apartment buildings to show you the girls. If you do not like what you see, just ask for more girls. Once inside the room, just use hand signals to tell the girl what you like. You will get laid inside the apartment using one of the
rooms there.
Just use your thumb up or down to indicate good or bad.
Do not use the ok symbol.
Tipping is not done in China.
Go during the day of you do not feel safe going at night, but I have never had any problems.
Of course, only take the amount of money you plan to spend plus a little extra.