Read the call for papers. When a conference is announced, the organizers will release this document, which specifies the subjects they are interested in, the length of papers and other important details. The conference may be subdivided into shorter units called sessions, in which case each session may have its own call for papers.
Calls for papers will be circulated on email lists and websites related to your subject. You may also find them on notice boards in your department or library. Another good way to find relevant calls for papers is to ask your adviser or supervisor to pass them on to you.
Prepare an abstract of your paper. This is a brief summary of your topic, emphasizing what is new and interesting about your work. The length of the abstract will be specified in the call for papers. Be careful not to exceed the word limit.
Contact the conference or session organizer. You may wish to do this informally even before submitting your abstract. If this is acceptable, the call for papers should say so. Otherwise, write a brief message explaining why you're interested in the session or conference, and include a copy of your abstract. Your message should be brief, simply explaining how you think your work is relevant to the theme of the conference or session. Be sure to check the call for papers for submission instructions, such as whether submissions should be emailed or sent as hard copies.
Wait to hear from the organizer. If your abstract is accepted, you should begin preparing your paper. In some conferences, this is the final step. In others, the organizers will want to see your completed paper before the conference. You may also be asked to submit a short biographical statement for the conference booklet.