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A family tree begins with you, and branches out from there. Start by writing down the names of people in your immediate family, then move to your parents' generation. Make sure you don't leave anyone out! Your family tree will be an important piece of family history, so take time to create an accurate diagram.  Write down your name, your siblings' names, and your parents' names. Write down your grandparents' names, your aunts' and uncles' names and your cousins' names. Write down your great grandparents' names and your great aunts' and uncles' names. Many people stop there, but you can include as many generations as you want. It might start getting difficult to fill in names once you go back a few generations. In an effort to make sure everyone gets included and all the names are accurate, conduct some research  to double check yourself. This is a great opportunity to learn more about  your family history.  Talk to older members of your family to find out more information. Find out the names of your grandparents' siblings, their spouses, their children. Ask around to find out as much as you can. If you're lucky, you'll get the opportunity to hear some surprising family stories and secrets, too. Do online research using a genealogy tool. There are many online tools that let you simply enter your name and your parents' name, then do all the research for you. These sites usually give you a limited amount of information free, then require payment for more in-depth research. If you're serious about mapping your ancestry, this is a great way to collect information. In addition to including the first and last names of your family, you might want to list their birth dates, death dates (if applicable), marriage dates, and so on. Having these dates on the family tree will make it even more informative as a historical document for your family. In addition to dates, you could consider including your relatives' birthplaces or hometowns. If you have access to photographs of your ancestors, you could include a small portrait of each person. This option is best for family trees that are relatively contained, since the pictures could take up a lot of room on your finished diagram.  If you only have a few photos, you could just include pictures of your immediate family members. Track down photos of as many family members as possible. If you want to make them all the same size, scan them into your computer and  use Photoshop or another photo editing program to change the scale.
Write down the people you want to include in the diagram. Fill in the holes by doing some research. Decide what other information you want to highlight. Decide whether to include photos.