TheStaircase is a learning method for SC2. It is not meant to be to take you to GM. Depending on your talent and your dedication you should try TheStaircase for about 100 to 300 games.

English guide (GoogleXLS)
German guide (GoogleXLS)

For Zerg it is very important to keep your Queen's energy as low as possible and to add Macro Hatches at the right time. Try to stay below 1.500 Minerals at all times!