How can I get the hk viza for work

The procedure is very complex and you need your employee's help to get that type.
In general, you need to provide your valid passport, an application form, a recent taken photo, HK ID card (if any), your proof of academic qualifications and relevant working experience. These are what you need to prepare.

You need to mail your documents to HK Immigration Department for application. Or you company can help you to hand in the documents.