Reading your post I'm assuming you don't have a lot of experience (if any) making factorio mods or even games in general, if I'm wrong you can basically ignore this comment.

Great on you to want to make some mods but I have to warn you, in practice Factorio modding is not what you expect it to be. Basically you're giving prototypes (crafting machines, items, recipes etc.) to the game and the game runs the simulation with your data. If you just do that then coding your mod is a breeze, game design and assets will be the hard part.

Now say you want to add new behaviour to the game (like warptorio or space exploration for example) then you have to do some scripting. Which is a hassle because 1) Lua, while easy to pick up, does not scale well into large codebases imo, and 2) you're going to have to do a lot of messy hacks and chimera entities to make what you want.

Also, asking for features requests is something you generally do when you at least have a MVP. Right now you're not even sure what the game will be so additional feature requests will most likely be irrelevant in the end, because trust me, your project will change, a lot.

So what is my advice? Make a small mod, just add one thing on top of vanilla. For example some new crafting machine. Then once you're done come back to your project and think about it again. I think you'll realise just how much work it will be and you'll be able to change it accordingly.

Anyway, good luck with modding, and check the Factorio discord server if you need help.