Let me introduce you to Starfall, which I learnt about through Larry Ferlazzo.
On this site, lower level students (Básico 1 especially) will get acquainted with the basics of English.
There are four levels of difficulty, ranging from the easiest (A, B, C) to the most difficult (I'm reading). It is a site whose aim is to teach (native English speaking) children how to read, so Starfall sounds like the perfect place for those students who are starting out learning English.
As you can see in the picture below, there are also some games we can use to learn specific vocabulary.