Use a spacer to get a consistent distance between the posts. When the post is in position, shovel dirt in around it. Once you've got three or four inches of dirt in, pack the dirt down, using the end of a 1x2, then keep filling it up. When all the posts are set hard, trim the tops to the proper height. Installing the Panels There can be many pieces that make up the panels of your fence.
Stringers are the pieces that run horizontally between the posts and support the fence boards.
Where these go on your fence depends on your fence design. Allow at least a couple of inches below the bottom stringer to prevent rot and to make it easier to mow. One way to attach the stringers is to cut them to fit in between the posts and toe nail them to the posts. You can also dado out a section of the post and set stringers in flush with it. Always used galvanized nails on any project that will come in contact with moisture.