Welcome to Rootschat!
I hope you have an interesting time when you start your family tree.
Of course your starting point must be yourself, followed by your parents, and then grandparents. Birth, Marriage and Death certificates are very important, and a free site you can use is FreeBMD and there is also another one called FreeREG as well, which is very useful. I started mine off on a very large sheet of paper before I transferred anything on to a Family Tree site. Familysearch is another free site you could also use. Happy hunting!
Regards.