For two months your shoot is in the trades being read by acquisitions execs whose job it is to pursue you. Press kit, as professional as possible. Stills, bios, story of how you made the film. Never send a tape, if buyers won't leave their offices to watch your film, they probably won't buy your film. Get a festival directory and determine where you should go.
Festivals cost money - entrance fee, cost to send print, cost to protect print, travel and lodging.
You go to be interviewed and get reviews, you go to get distribution, it's all about you and your film being discovered. There are 300-500 fests per year all over world. Goal is to get a domestic theatrical distributor. Sell to foreign territories. Negotiate with a foreign sales agent or sell territory by territory, get a payment schedule.