I recently graduate from my second degree and I achieved a First class. I would like to take a PHD research in computing but I have no idea and I do not know where to start. Do you have any suggestion?

The first thing to find out is whether or not you qualify for funding. Visit the funding section of our site for links and information

I guess the first thing that you need to find out is the specific area that you're interested in. Once there, you need to locate people who are working in the field and try to see if the topics discussed relate to your interest. If it's a 'yes' there as well, you might want to get in touch with the people/uty and express your desire. Make sure you include a sharp CV and a short write-up of your ideas. Good luck!