Hello! Firstly I wanna say that it’s okay to take a while on your story, sometimes it feels like everyone is fast while writing and you’re taking ages, but that’s totally okay, so don’t worry about it! 
Secondly I would say, take notes of literally anything that comes to your mind, you never know when it can be handy either for future stories or a specific scene in your current one. Now for planning, I usually have the overall idea of the plot, but then I start to think of drama to add into it. I don’t know what genre you’re thinking of but just incase. Take the plot you have in mind and think: What kind of drama would fit in it? For example if it’s a racing story, make the MC and LI rivals, so there’s competition between them yk? And so on…
Sometimes even date ideas come up in my mind, and I immediately write them down, knowing myself I’ll probably forget them sjhdja 
But yeah that’s my input on this! I hope I helped and happy writing!! 
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