aight allyou need is garden fencing and 2x4's Hammer nails Staple gun and shovel. Start off by making an X with two 2x4, make four of them. Then set them up in a rectangle shape. Next dig a six inch trench around the perminiter. set your bottom layer of garden fencing inthe ground and staple it to the X's. Go the whole way around Don't worry about a door Yet. Next you fill the trench back up( The reaseon for the trench is so no animals can dig under the fence to sneak in!) Then if you have room do a another layer of fencing on top of the bottom one. YOU NEED STRING. NOw for the door get yuour knife and carefully cut a opening straight down. Pick a spot and cut the fencing straight down. now you have a closed off green house type of protection from all animals except squirrels of course. TO go the extreme you can get more fencing and make a roof but you need poles to go ontop of the X's and tie down the fencing to the poles. It worked for me and will work for you too

uSE STRING TO TIE UP YOUR DOOR