Create your songs. Decide if you are going to write and perform your own rap songs or use preexisting songs. This will be based on your own abilities and preferences. Try to choose a wide selection of songs that will showcase the full range of your talents.
Record the beat of your songs, or if you prefer, avoid this step and only record the lyrics without a back beat. Doing this will draw more focus on your skills as a rap artist, but may leave the listener thinking you did not put in the effort.
Assess your budget and needs. Do you need to have a professional studio record your demo, or can you make do with recording it at your home. Inquire at local studios as to their rates for short recordings, and book the studio if you desire. Alternatively, use Macintosh's Garage Band or Window's Media Player to record your performance.
Practice. Set up your recording equipment and take several recordings of you performing your songs. Ensure that you sing loud and clear for the recording equipment to pick-up your vocals.
Put together all the recorded songs onto one CD if you are doing the recording yourself, using high-quality CDs and a slow burning rate. Alternatively, buy several copies from the recording studio, and ask that they keep a master copy should you need additional copies in the future.