In some ways finish carpentry might be easier to market than general remodeling, because you offer services for which their are very specific key words, like: crown molding, wainscoting, floorboards, stair railing, etc. That is to say, people are searching Google using these highly specific words.
The first, and perhaps least expensive, thing I would suggest to do is to set-up a Google+ (Google My Business) page, with a very detailed description of your services, and lots of photos. I'd then do the same for Houzz and Yelp. You can do all of this yourself in about 2 hours.