Mitch Justins advice to get Traditional Bowyers Bible Vol 1 should be taken to heart, talk to yer mom and dad and perhaps
you can convince them to buy it for you. Tell em its better that your at home building bows than running the streets getting in trouble
Work em hard and I'm sure you can pulll it off. There are many different woods that will work but red oak is readily available, cheap and will make a good
first bow, most likely you will need to back it with linen, silk, rawhide or even paper to hold it together. Do your homework first and success is more likely. Where do you live perhaps there is someone on here close to you and is willing to help.
Good Luck and keep us posted eh.