The process of searching for citations generally involves searching for either your name or the works you have written, and then limiting the search to those works published in the reporting year (i.e., 2015) that cited to you. I recommend searching both WestlawNext and Lexis Advance at a minimum. If you wish to include a wider variety of citing sources, you may also want to consider searching in Google Scholar and in Web of Science. This guide will give you instructions on how to conduct searches in all of these systems.
In addition to these searches, you may receive notifications of citations to your work through a journal in which you published, such as the New England Journal of Medicine, or through a third-party site, such as Academia.edu. Those citations, of course, can also be entered into your citation report.