-Enough 4 or 5 foot “T” or “U” posts at Depot or Lowes to space them about five feet apart. (This is the pricey item.)
-ton of long zip ties
-50 or 100 foot roll of 4ft chicken wire, depending on how far you need to go
Pound posts into ground at five feet intervals. Attach chicken wire with zip ties, making sure at least six inches of wire folds toward the inside of the pen.
I would, however, you come up with a more sophisticated gate system than me. I twist wire around concrete nails in the side of the house. not very nice looking once the kids climb over it a few thousand times.