Since the grey theory is done now you can go on reading through the example code you can download below. There's just a few more code than discussed here so just keep trying to understand what happens there.
Now that you know how to handle tiles and maps there are many directions where you can extend your knowledge. For example you could learn about save and load map files, animations, multi-layered maps, smooth scrolling (pixel-based), units or even pathfinding. See the tile tutorial start page for the corresponding tutorials!
Thank you for reporting typos and until next time!