First, is it worth it?
PMOs are not necessarily best option for smaller organizations that aren’t likely to require lots of structured project management processes. It’s always good to have some standard practices and policies in place, but if your company doesn’t have the flow of project dollars going through the organization to warrant it, then spending the money to actually set up a structured PMO and stock it with several experienced project managers may prove to be both a waste of time and a waste of money...