How to mentor research students?

Hi. I am neither a PhD nor Masters student but a PhD graduate so I don’t know if I should really be posting my query here or not. I’m a newbie to the research supervision at Cornell university where I’m given the responsibility of guiding two Masters’ students from my research area only. Because I do not have any prior experience of handling research students, I’m not confident if I would be able to answer their queries, helping out with the research process, and evaluating theses. I’ve fixed the meeting with them next week but I don’t know what shall I do, how to begin, nothing at all. University has given me a handbook of supervision of graduate students, but there is a lot of difference in reading and implementing those advices in real life. I’m anxious how to get started. Any suggestions please?