Your supervisor is the person to ask for guidance. S/he will know the regulations surrounding your MPhil and they vary from university to university, so a forum like this really can't help.
Research paper databases - go to the website of your university library and see what they subscribe to. Many will have pages detailling resources for specific subjects which might also be helpful. If you don't know how to use the databases, then contact your library to see if they can arrange training.