Typhoid injection and other vaccines (Hong Kong)

Hi,
I have to update and make some injections, but I don't know the process here.
Should I have to the doctor first, ask for a prescription, buy the injections at the pharmacy and come back again (like in France)?
Should I have to go to the doctor only once, as he has all the injections in stock ?
Should I have to go to a doctor or community clinic ?

I live in Wan Chai. If you have address, they are more than welcome !

Thanks a lot for your advises.