A bank could be a custodian but most (if not all) are not set up to be nor are they willing to do so. You will need to use a custodian specializing in self-directed IRAs.

By asking your bank for a statement if you made it through the bank.

i have no idea good question

A savings account with a parent as custodian. You have to be 18 to have your own account.

The responsibilities of an IRA Custodian are to manage money for retirement, generally at a bank. This generally works by someone working for 20 years, and having enough money to cover them for another 15 years.