ok that’s!! i’m a starting writer too so it’s kind of something i’m learning as well but here are some of my advices:

• as soon as you get some inspiration, write. on paper, on your cellphone, or on your laptop. if you can’t, make some notes so you can remember what you got inspiration for, it’s really helpful !
• there are times i can’t write the beginning of a hc/story, so i start writing the part i have more ideas about. the middle or the end, it doesn’t matter as long i work it through the others parts.
• sometimes you get a writer’s block. and that’s ok ! forcing it out of you might be worse. when i get one, it comes with a period of time when i have a lot of anxiety and a wave of depression almost at the same time. so i can’t really do anything but worry my mind about those things i’m not doing and it kinda breaks me from inside. however ! i’m trying to develope a healthy method to make myself productive during it.
• try to visualize what you want to write and how you’re gonna do it before writing. sometimes it doesn’t work and i just let my fingers go in accordance with my imagination and my ideas flowing out and it works out just fine as well !
• whenever you feel like you need a break, take it. i know you may be bursting with ideas but it gets tiring mentally and your body might suffer from it. i usually get rlly bad headaches when i keep writing even after my body shows signs that i should stop.
• please, read ! anything, everything. this advice from my professor helped me immensely. like, it actually made me find inspiration for the things i write. i don’t know how to explain it very well, but when you already have something to think about, a basic prompt you saw on a book or even in a daily occurrence, you’ll be always with a idea only waiting to develop !

well, that’s it i guess. this works for me, so i’ll understand if may not work for you too, since we’re all different. but if anything, that’s what i have to offer as a starting writer !!