Start with yourself and work backwards. You probably know who your parents are, and your grandparents. Ask family members to fill in the details you need. Utilize the internet as there are excellent free resources for locating family members.
Start with yourself and immediate family members since you already know more about them, then work backwords to uncover your ancestry. Conversations with relatives will uncover additional information.
Family tree sites like Ancestry are excellent places to start. In addition to software to help make a family tree, they include resources like public records to help you find out more about your family history.
you can start a family pedigree any where you want really. nothing really to be fussy about it really just your choice on were you start a family pedigree chart