"How can i create a new ASIN"

Stop jumping ahead so far.

FIRST get permission from any BRANDS involved to sell on Amazon. More and more often Amazon is requiring an LOA from the brand to sell here. Not often enough, but enough to be dangerous if you don't have one.

Second -- buy ONLY from wholesalers that are authorized by the brand. Ask your contact at the brand who they have for AUTHORIZED distributors and ONLY buy from them.

Even before those steps, do you have a business license that allows you to make tax exempt purchases from those wholesalers?

If not, start there.

AND do as @Seller_rI7BZIczK8iACsaid.

You are NOT ready for selling on Amazon or (probably) any other site at this time.