Tips and hints for video editing freelancers?

Hello,

I'd like to start working as a freelance video editor. I've already informed myself about the legal situation: registration with the tax office, income tax, sales tax, income surplus calculation, accounting, a suitable invoicing system, etc. Is there anything else important I need to consider? The legal situation is sometimes complicated and confusing, and I want to avoid violations. Does anyone have any tips or advice related to this, or in general on the topic of freelance video editing (pricing, getting orders, invoicing and accounting data systems, time management, etc.)?

Thank you in advance, I would be very happy to receive any helpful tips.