Cream puffs sell like hotcakes!
Things to do to sell a boat:
Clean, clean, and clean some more. Compound and wax, clean the bilge, clean the engine room, scrape down the rust, prime and paint. Polish the isenglass, clean the teak. Make a potential buyer say "Wow this boat looks good." an alternative is to lower the price so much the buyer says, "Wow, this is cheap enough for me to fix up."
How to pick a broker:
If there is an broker's office at your marina pick the closest guy, make it easy for a buyer that is already going to his office to look at one more boat that is close by. If not at your marina, pick one that is not too far.
Do not pick a broker that does not have an office, there are many who are on the internet but do not have an office. Try to find one who knows something about your type of boat, check Yacht World and other sites for similar boats and find out which brokers list them.
If you try to sell it yourself, look at listings on Yacht World for similar boats and give the same type of information. Get a camera with a wide angle lens, and take lots of pictures, give the location, price, and a list of upgrades and major equipment. Tell the potential buyer to contact you for more pictures and more inforamtion, maybe you can get to talk to them and tell them what you have done for maintenance and upgrades.