Couple of questions first...
1. how big are the parts you want to machine?
2. what materials?
With those answered, you will get responses.
I currently own the HF version of the G8689. You will find it referred to by its manufacturer name here. The Seig X2. Do some searches for that and you will find a wealth of info.
Being 16 and all, I have to ask a few more questions... Have you ever used a metal machine before? I only ask, not because I don't think you can't handle it, but because you have to respect the machine (even though it is small). Folllow good safety practices and the like.
If not, maybe you good find someone to mentor you or a vocational program?