FFW, I started shooting archery when I wa syoung and had no money as well. So I know the feeling. What I shot for the first two years was a box filled with rags, clothes, blankets, whatever old material you have. Pack it in nice and tight then close up the box with duct tape to make sure it stays packed. As the box takes more hits rotate it, turn it, patch it up if you can. Keep using the duct tape to patch it up. The packed cloth will stop your arrows and eventually you'll need to get a new box and pack it again. This will work. It's not perfect, but it will work. I strongly suggest getting on youtube and watching some beginner videos. I learned allot that way. Don't get discouraged. You can learn to shoot well, just keep at it. Good luck and ask any questions you have.
-Jake