Arbitrage question (newbie)

Hello Guys,

I am just now entering the amazon world and learning a lot of things,

I heard about online arbitrage recently and started looking into it and I am confused on this particular fact that if for example I bought an item which has a brand ABC on it, from Walmart and listed it on amazon, will there be an issue since the item already has a brand and a UPC on it.

Also, is there anything I should be looking into if I started doing online arbitrage?

I am complete noob in this regard and looking forward to the community for guidance.

Thanks