Reading Greek should prove all you need to learn Greek this year. However, if you are interested in the language and want to find out more about you, the following are a good place to start.
Colvin, S. A (2014) A brief History of Ancient Greek [e-book]
Horrocks, S. (2010) Greek: A History of the Language and Its Speakers [e-book]
Allen, W.S. (1987) Vox Graeca (Third Edition)
In terms of courses, the other text book commonly used in this country is Greek to GCSE (parts 1 and 2) by John Taylor. There are copies in the Library and if you want another explanation (after Reading Greek and me), it can be useful to look up an explanation of a topic here as well.