Can i create a underage broker account?

[A Nobody]

In North America, you must be 18 to open a brokerage account. You can have a parent open a custodian account for you using your social security number and when you turn 18 all the assets in the account can be moved to an account in your name.

There is no such thing as a "best" custodial account" it isa not a service but a registeration used to define a type of account - you have no choice as to what's "best", they are all the same