I am going to try to put up some wood fences 6' tall located in south
Florida.

I talked to one contractor and they told me they will need to dig the post
24" deep and pour concrete. Some told me 48" deep. Some said 24" deep at
intermediate posts but 48" deep at corners or gate posts. Any idea what is
a good depth?

I am now thinking I will do it myself.

The posts will be spaced 4' apart. The post will be dug XXX inches deep and
with concrete. Now regarding the standard dog eared pressure trested
privacy wood fence panels, they come in 6'x8' so they will have to be nailed
onto three posts. The panels have three horizontal pieces of wood. If I
nail them right onto the posts, the panel will "stick out" by the width of
the wood member. Should I notch the post a little so the horizontal member
would be mounted flushed?

Thanks in advance,

MC