First of all, welcome! You are starting off in an exciting journey!
To start you off, I recommend this article from one of our co-founders that goes in depth into that question: https://txmo.co/taxationanswered
We also offer an online course that goes through this in a bit more depth (but still in an approachable manner): https://taxumo.thinkific.com/courses/business-registration-and-taxation-for-the-philippine-self-employed-individual
Good luck! :)