I don't think I've ever installed a transfer switch that was made by the generator maker. probably the leader in this field is the company with the unlikely name of "Automatic Switch Company," or ASCO (Not to be confused with the valves of the same name).
Your supply house should be able to put you in touch with a rep. The switch company will help you select the switch, and could very well have someone there to inspect it before you power it up.
Even if you don't need to break a PoCo seal, you really need to get your PoCo 'in the loop.' They will make the appropriate notes, so as to limit the risk to their linemen.
The generator rep ought to also fill you in as to noise, and the regular exercising of the genny. My customers run theirs, weekly. Some transfer the load at this time, others have "load banks" (glorified toasters) that are used. And -trust me on this- noise is a BIG issue. Get the mufler kit!
