The easiest way for me was to use the DAUM map feature
Go to http://www.daum.net
Look under the search bar for the word "지도" and click on that.
That will bring up the DAUM map feature. Find your neighborhood and look for the little square bus symbol.
Click on that and then it'll bring up the different bus numbers for that bus stop. Click on each individual bus number and it'll show the route for it.