Signing up to sell is a separate process.

You will need to sign up to Managed Payments, which involves more than just adding a bank account.

I suggest you read the FAQs about selling, then come back with any specific questions.

Yes you are

And something very important

As Dave said, you need to be signed up to Managed Payments and be verified to sell

You also need to know the basics of selling before you even think about listing things