I totally agree. That's also what I and a lot of other sellers want.
But the biggest obstacle is how can you access a good source of products for business? If you have resources, how will you distribute them so that your cash flow can be rotated as quickly as possible?
This belongs to business, and FB is just a tool for you to promote.
However, you can learn the market through FB. Please refer to the groups and fanpages of colleagues in the same industry for information.
Also, here is an article that I think you should read and refer to for ideas