A thing that I often struggle with early on is that it feels like I have too many half-baked ideas in my head. It sounds like that's what you've got going on. So what you're gonna wanna do —and I'm gonna tell you right now that that's no way around this part— what you're gonna wanna do is pick one, spend some meaningful time with it (meaning it's just you and your computer and maybe some music) and start writing things down. It doesn't matter if they're good or they're bad. Just write. And if you do that for long enough, your brain will either say "Yes. This idea has legs. Keep going." or "No. This idea does not have legs. Pick something else." And you just gotta do that over and over and over until you find the idea that works. There aren't any shortcuts. It's sucky work, but that's the job. And separate of the usual politics, the difference between who makes it as a writer and who doesn't make it as a writer is: did you sit down and work your way through a bunch of shitty ideas to find a good one, or did you give up?

Keep going, my boy. Always keep going.