If you got into trouble while you were a minor, you should be able to purchase a firearm. Records are normally sealed for minors. There is no website to check your name.
You should schedule an appointment with your local police chief and ask her. She should be able to give you the correct answer for your jurisdiction.
You need a lawyer familiar with firearms law, patience and lots of money to find out.
You need a lawyer familiar with firearms law for your location to get a legal and correct answer.
Persons convicted of crimes other than minor traffic violations are not permitted to own firearms. They can apply, but will be turned down almost immediately - you may as well not bother.
No
No
Being a person that may not possess a firearm. This may include having been convicted of a felony or crime of domestic violence, being an unlawful drug user, being a minor, etc.
If your phone has pornographic pictures of a minor, or you are a minor, you can get into trouble.
Having ANY degree of felony makes you ineligible to purchase, possess, or have access to a firearm.
Federal law says you have to be 21 to purchase from a dealer, but you may own a handgun at any age. Minors may own firearms that are given to them by their parents, relatives, or legal guardians. However, they may not generally possess firearms unsupervised until they are 18 years of age. There are exceptions to this rule, such as when a minor possessing a hunting license and having passed a hunter's safety course is hunting, possession of firearm(s) on certain types of private property, and possession of firearm(s) in one's own home. If you purchase from a private party you must be 18. Knowingly selling a firearm to a person who cannot legally purchase or possess the firearm (such as a convicted felon, minor, or drug addict) is illegal, and punishable by up to 180 days in jail. Under state law, you must be 18 to buy a firearm of any type (handguns or long guns) from a private seller.
Yes, a minor lying is not a defense.
It can depend upon what state (or country) you reside in. You will have to research your own state's firearm laws.
They all can get in trouble and the seller too.