If in the US, then yes. The default will be replaced with paid in full. Simply send proof of the payment to the three credit bureaus.
Yes, it will report equally.
yes
No, your credit rating is separate from your spouse. If he or she cosigns it will only effect his or her credit rating.
This could damage your credit score. It will be harder for you to get credit cards or loans in the future.
No, you signed, you are equally responsible for the payments, you are also equally responsible for what happens with regard to default. This is why the lender permitted you to sign as a co-securer of the original loan.
From what I understand any credit activities on a minor's name is illegal. You must be 18 to establish credit.
No. There is no legal obligation for the lender to notify the cosigner that the primary borrower is in default.
Yes. If the original borrower defaults, and the cosigner is unable to take over the debt.
You will default on your credit card accounts. Being an unsecured loan, there is little a credit card company can do. That is a risk credit card companies take. Regardless of why you can't pay, non-payment will result in default. The extent to which a credit card company will attempt to collect depends on whether or not they feel you have sufficient income.
They will look at both but the good news is you will get a better rate if her credit is good than you would have if you'd signed on your own.
That is a variable, it could put you in a maxed out situation where you couldn't get a loan for yourself. You only have so much credit to use. Good Luck
If you default on your loan, the cosigner is stuck with paying it off. If your credit had been any good in the first place, you would not have needed a cosigner.