Start with yourself, put everything you know that is factual about yourself, spouse and children. Then your siblings and their families going down the line until you have all the newest members of your family.

Now, that you have the newest information recorded, go back to your Parents, and their siblings, your Aunts and Uncles and their children, your Cousins and your parent's nieces and nephews.

Your parent's Aunts and Uncles, are your Great Aunts and Uncles. Their, children would be your parents cousins. Then go down the line getting their nephews and nieces, they too, would be your great nieces and nephews. Then you'll have your cousins, and your nephews and nieces....