Clothing line on Amazon

If I want to start my own clothing line on Amazon from the same account where I do RA is it going to be a problem ?

Secondly I wanted to list the item as a generic brand and create completely a new listing ( if I do so is it going to be a PL or other seller might join me ?

If you are buying / selling the clothing as the same business then no issue, if it’s your brand then you own the rights and others sellers are not allowed to join you