Open a word-processing software (Microsoft Word or WordPad, for example), and reveal the rulers from the View Menu. Type a date -- or an event -- with a dash and right-click on the horizontal ruler to set a Tab stop between the date and the notes. For example, "1988 -" on a font size 11 reaches 1 on the ruler, so you have to right-click on 1.5 to leave space for the reader.
Press "Tab" to instantly move the cursor to the Tab spot and start typing your notes. Place the cursor before the first letter, and press "Tab" every time words of a new row appear on the left side of the page.
Make dates -- or important events -- bold to distinguish them from the notes. This also helps the reader spot a specific date or event more easily.
Identify the purpose of your bio. Include only professional experiences and achievements if you intend to send it to a recruiter. Include personal information (even your date of birth) if you use the bio in your personal website, for example, or when presenting an important person's timeline.
Write in the third person, even if it is your bio. The third person gives a sense of authority and objectiveness, even if the reader knows you wrote the bio.
Avoid long sentences and big paragraphs. Each note must include concise sentences in active voice (subject, verb, object), and the paragraph must not exceed three lines. Write tightly and avoid elaborate language.
Provide only facts. The bio lists only experiences and achievements, not wishes and aspirations.
Stress the important parts. Do not write three informative sentences about your first job, for example, and just mention the job title of your major breakthrough.