With that you are better off to consult with an attorney or CPA. It is extremely complicated issue.
Not really anything left to be considered a “tip”. Just do your due diligence before purchasing your goods.
If you are serious about this you need to live by “zero trust” regarding every aspect of your business. You can and will make money selling online just be very careful. Keep in mind that amazon can and will seize your inventory and all your money if they get a complaint about the legitimacy of your product.
So, make sure you have 100% viable chain of custody and authorization from the IP owner. Many amazon sellers are just flipping trinkets from big box stores and doing online arbitrage. It all depends on you…