One: very simple, you don't have to do anything if you want to be a black shop; If you want to run a company and register an advertising company, you will have your own invoice; If you want to run a booth, you only need to get a business license.

Two: Generally speaking, you don't need any license to help an enterprise make a brochure internally, but you need a production license for packaging, but these are not the concerns of advertising companies.

Three: If you need an invoice, you can register with an advertising company and issue your own VAT invoice. If you are not registered, you can find another company to buy invoices.

The minimum registered capital seems to be 3W.