How to Catch Pokemon
Tracking down, finding, and catching Pokemon in Pokemon Go requires a careful, concerted effort. Your first step is to investigate the world around you, especially rusting wild grasses you’ll see on your Pokemon Go world map. Rustling wild grass does not always indicate a Pokemon. By clicking on the lower-right bar, you’ll see a list of different nearby Pokemon profiles. Their distance from you is indicated by a set of footprints. Three-footprint Pokemon are quite far away, while zero-footprint Pokemon are right on top of you-they may take a few seconds to spawn. Your phone may vibrate when nearby.
Quelle: http://www.ign.com/wikis/pokemon-go/How_to_Catch_Pokemon