^yup what they said above. find a local shop who deals with them or there are a few online stores that are very helpful with the whole process. you're looking at the paperwork, $200 tax stamp, cost of suppressor and then waiting several months before you have it in your hand.
im contemplating one as well and have it narrowed down to the silencerco sparrow and swr spectre 2, just waiting to take the plunge.