Hi, this
link gives you all the details and how to go about it.
Yes you can hire a helper from India or an Indian helper who is working in Hong Kong. I have done that in the past. The process is fairly straight forward as far as you have all the documentation and minimum regular income/adequate bank balance.
Some shoddy recruitment agencies as well as freelance helper cum recruiters would try to tell you that it is too complicated either to make money off you or palm of a relative/a friend or a serial contract breaker. However, most helpers who come and work in HK are good and are willing to learn.
You have to interview well and be clear with what is important to you, try them out to see their working style and CHECK THE REFERENCES (do not skip this part at any cost) and be patient with the one you eventually hire so that they have time to learn/adapt to your work. Finding a suitable helper is not very easy though and it is purely luck when you are hiring from overseas.
Hope this helps.
Thanks