If he asks you to issue VAT invoices, if you are a small-scale taxpayer with formal registration, you can issue ordinary VAT invoices through the golden tax system, provided that you have a special invoicing machine for the tax system. You call for tax consultation, and there is a special company to configure it for you.
It is easier for you to go directly to the national tax hall of the company's jurisdiction and let the national tax invoice you. Just write an application directly. Specifically, you go to the lobby and ask, and the people there will tell you what procedures you want.
As for paying taxes, you can just find an agency to do it for you without a special accountant.