The same as any other ear piercing I suppose - infections mainly.
Yes, the other dangers is penetrate the cartilage when piercing your septum.
Where? Place: any tattoo/ piercing shop.
Any piercing shop with parents concent.
The major risks of an industrial piercing include ear deformation, migration and even rejection. If it is not properly taken care of it can move, and be very painful. Someone very experienced should preform this piercing, as if it is not done properly, the risk grows higher.
In the U.S. if you have parental consent you can get any piercing except genital piercings.
You can be any age as long as you have your parent's permission and they are present at the time that you are getting the piercing.
it's the same as an industrial piercing.
Any piercing can bleed. Just remember, you are sticking pieces of metal through your body in places that they were not meant to go.
Any professional body piercing studio will carry a whole host of high quality jewellery for your industrial and may even custom order pieces in for you.
No
If the piercing is completely healed, no. If the piercing is still fresh/new, possibly. If you remove it, continue to clean & care for it as you would any other wound.
Any body piercing studio will be able to do your cartilage piercings, check them out under body piercing in the phone book.