@Ahsen: I'm not too familiar with all of the sources online, but I believe that a lot of people advocate www.central-fixation.com
for Bates material. Familiarize yourself with the concepts and go for it! You might have better luck with help if you create a new topic in the "Bates method" section of the forums.
As for the glasses, it is a completely personal decision you have to make for yourself. According to Bates, the wearing of glasses will always delay improvement in vision. Just how much exactly is up for debate. Your prescription appears to be on the low side (compared to many of us here), but you really need to find out how well you can see without them first. If you can comfortably use the computer without them, I would advise not using them. In general, the "right" answer about glasses is "use them only if you feel that it is necessary".