Learn to write a bass clef. The bass clef looks like a backwards C with two dots that fall on the third and the fourth spaces from the bottom. These dots surround the note F that is directly below middle C. This information will aid you in determining other notes.
Write middle C by using a ledger line. Draw a note head sitting just above the top of the bass clef staff. Leave a small space between the bottom of the note and the top of the staff. Draw a short line just wider than the width of a note through the center of the note head. This is middle C.
Learn to write the rest of the notes in the bass. The lowest note on the staff is a G. The lowest line on the staff is an A. From there, each pitch moves alphabetically, returning to A once you have reached G again.