what is your budget?
can't really help until we know that
With money you can do anything. but im guessing you dont have alot? as i was broke when i was 15 :P just the software might be to much for you for anything but a 2axis router system.
talking 200 for the cheapest 3axis software i know of. then maybe run it with turbocnc but that is 60 now i think. really be nice to run it on mach2/3(150)
do you have access to software in your school? or are you only thinking 2axis ? doing somthing like dxf cad pictures to gcode.