I want to start self studying AS computer scienceWatch this thread
here are some useful resources on the interwebs:
When I did Computer Science AS there was a programming project. It's likely you'd have to do one of those, and without teachers that would be hard... Look for an exam-board your like first, then buy the appropriate textbook for that exam-board. AQA was good for Computer Science in GCSE, not sure what it's like in AS though as I was doing WJEC (I do not recommend!).