Q.Nectarine, Peach, poire
I’m leaving in south Florida area. Where can I buy those trees or seed to plant?
Do you think they will grow there?
Regards,
Roody

It won't be easy to grow just any variety of stone fruit (peach and nectarine) an pome fruit (pear and apple) in south Florida, but it's possible if you select the right variety. The big issue is that most varieties require a cold winter to induce flowering and fruiting.
This article from the University of Florida has some authoritative information and links to other pertinent articles.
http://gardeningsolutions.ifas.ufl.edu/plants/edibles/fruits/deciduous-fruit-trees.html