Read something that is interesting for you. If it's not interesting, you probably won't do it.
Read something that is easy to read - choose something one or two levels below your language level. You shouldn't have to look up more than two words per page.
Extensive Reading Central – has different levels (Try level 8 to start) Read and listen. Vocabulary help. Sign up for free.
English e-reader – download full ebooks AND audio. A small collection.
Breaking News – you can read the same story at different levels. There are comprehension questions, but no answers.
British Council – has different levels and comprehension questions
Lit 2 go – Read and listen – Try levels 5 and 6
ESOL Courses – has different levels and comprehension questions (click "Activities)
Free graded readers - has different levels. Reading only.
We love Teaching English – has different levels and comprehension questions. You have to browse around.
English club – A mix of stuff. Some with audio and comprehension questions
ESL Lounge – has different levels, comprehension questions
Study Zone – read, listen comprehension questions - only a few stories
Learn American English online – has different levels, read and listen