Hiring international workers can be an involved process, so make sure that you have a specific role that you are hiring for. Often companies hire internationally when they can't find the talent they need locally.

There are many, many visa options out there. Are you hiring someone for a temporary position or do you want them to stay long-term? If you are hiring an individual, are they bringing a family along? Does their spouse also want to work? There is a lot to think about. Check out this list of temporary work visas. 

In order for international workers to join the US workforce, you have to prove that particular talent is needed and you could not find it locally. Visit this site for an outline of the process. 

The exact procedure for this step will vary depending on what kinds of status you are applying for. Check out this helpful guide for USCIS.