Fba powersports wholesaler needs help on how to establish a brand with large demand yet fragmented amazon infrastructure

Hello,
I want to say thank you to everyone here who is willing to take the time to read my post.

I’m currently a powersports fba wholesaler. I have connections with a particular brand what has large USA demand but not on Amazon.

Upon researching I noticed there’s 4700 asins marked general brand for a catalog of maybe 100 products and 1 common seller on all 4700 asins.

No one created proper parent asins no order.

The US ambassador of this brand is a family friend. I would like to propose cleaning house and properly establishing their brand on Amazon in the US.

Would someone break down what that would entail?

I can have documentation from the manufacturer, us ambasador proving my ability to resell this brand as well as all documented DOT and safety standards for each Asin.

What more would I need?

Thanks, Brenden