Invitation Letter For A Naming Ceramony Format HOW TO WRITE/ WHERE CAN I Find A Good Conviencing Invitation Letter To Invite My Brother To Visit Me In U.SA.?

HOW TO WRITE/ WHERE CAN I find a good conviencing Invitation letter to invite my brother to visit me in U.SA.? - invitation letter for a naming ceramony format

I am a citizen of the United States and not knowing what or how to write an invitation to come Counsulate conviencing American visa for my brother to me.
It is also a visitor visa for non-immigrant visa and OT conditions, it is to fill a form, and what is the name of the form .. thanks so much