1.Choose an area close by.
2.Check out the price point of homes in the area that ar ein most demand.In other words in your mls stats(you will have to dig for them) see what bracket of home srepresent the majority of sales.Example 100-200k tange,200-300k range etc.
3.Then find a few subdivisions that match the majority buyer profile.
4.Look at the actives,solds,expireds,withdrawns,and days on the market.(Subdivisions with high days on the market,alot of withdrawns and expireds are not good candidates as everyone in the subdivision is overpriced or there is a negative feature buyers aren't willing to overlook about the subdivision)
5.Once you have short to medium days on the market to get sold you have found a potential candidate.Now you need to look at if an agent-broker already has a dominate share of listings in the nieghborhood.In other words if there are a total of 20 listings in the neighborhood and one agent-broker controls 12 to 15 of the listings or more they have a dominate market share.If that's the case move on to the next neighborhood as they already have a stronghold.
If there are 20 listings but it's 6 different agent with 3 or so listings that subdivision is still up for grabs.
You have FINALLY found a subdivision to market to after all these steps now you need to define your plan of action the length of the campaign,the money involved,and the timing and execution of your ideas.You will also need to track your number to tweak your campaign for your best ROI.
good luck