Invoicing in EU country before company establishment

Hello Friends...

I am yet to incorporate a company in EU but I want to receive payment for my writing services under my business name. How can I do that?

• Can I receive in same business account or do I need different?
• Is paypal business right way to do it? What if I change business name later? Also I don't know how much affordable it is to receive payment via SEPA or Paypal?
• I don't know ABC of Invoicing but I read VAT needs to be accounted. I didn't include it in client billing contract so how will it work?

Thank you for your time....