He older than me my dad and this where very young so her mom made her give him up

How old is your brother?

You can't start a search at all until he is at least 18.

You are better off asking your dad to search--he will have more options than you do.

You can either hire a licensed private detective, or you can register on reunion websites. The sticky at the top of the adoption page lists a couple of the more popular sites.