Which part of plant grows first flower or fruit?

I don't think branches were the first steps for a tree.I think it can be a seed like;an acorn,it grows into a oak tree......I tried planting an acorn when I was 6 and I watered it everyday,it grew(but just a little)I think it takes a while to grow because it is still in my backyard and all I see is just a twig with 2 or 3 leaves.

Thurs.Dec.27.2012

D.R