Once you have your IDE set up, you probably would like to start with programming part. One of the best ways to get going would be to try out the OpenLayers examples and see if they work on your environment. It might look confusing in the beginning but OpenLayers isn’t really too complicated and the documentation makes things a lot easier to understand (Basic concepts of OpenLayers).
Isn’ there an easier way to explore things?
If you think that is the case, then start trying out these mapping exercises,
- CartoDB: getting started with CartoDB.js
- HERE Maps API
- Leaflet examples