Hello! So glad to see you're joining us this year! Ashe has been posting a series of useful tips on twitter: https://twitter.com/pixelsandpins/status/1362144689386778627
My personal suggestion is to plan to finish making your visual novel in two weeks. Everything always takes longer than expected, so it's a good idea to really keep the original scope very small. That way you can spend the rest of the buffer time polishing and refining what you made.