Does anyone have any advice to someone who wants to become a Amazon reseller?

I got intrested in becoming a Amazon reseller years ago from youtube short videos of people making a great income just by finding every now and then a product thats actualy worth buying on those sites based out of china but they mainly sell misleading items that end up being trash. I never had any luck finding a good quality product that i could sell for a competitive rate on any of those sites.

But luckly just the other day i found a high quality product that i know wont make me rich but i think it would at keast be a little nice side hustle for a little bit of extra cash that i could sell for a really adorable rate compared to all the other companies selling the same product on there. Is there anything i should know before i buy inventory and apply to become a seller? Any advice would be much appreciated! 🙂