Citizen, novice question re. freelance work on top of regular

Hello, I scoured the sub but find myself confused.

I work PT for a company who does the tax calculations for me. This year I’m going to take on freelance work where I expect to earn a few 万 a month, as extra on top of my PT job.
Do I need to inform the start of income (個人事業の開業 form) if it’s secondary income or do I just file a final tax return next year to declare the extra income? Or both?

Would someone be able to point me in the right direction for learning about the ‘’invoice’’ system? Trying to search (in English) about freelance work has lead me to info about visas

by MyNoodleLard

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