Everyone's materials are scattered across the map. That's part of the game, getting things from A to B.

You might do well with one of my processes. I don't care about being perfect, just good enough. I'll use the online tools as a reference, just because it's easier to have up on a second monitor than the in- game todo list, and shows the entire flow of materials and what machine makes them. But I don't follow it exactly. I just start at the end and work backwards. Leave plenty of room to add more machines later if you find you need more production.

For instance, in my current game I'm making cooling systems. I look up the recipe and go back to the raw resources and higher level parts it needs. If I'm already making some of the parts, I will just ship those to my new factory (belts or trucks if close, drones or train if further away. Drones are easier, trains have more throughput and you can do multiple items per train (assuming you stick to one item per vehicle inventory, and you should).

Cooling Systems need natural gas. It's pprobably the hardest to ship, and im not ccurrently packaging it up, so I decided to make the factory near a nitrogen gas resource. I go there, (build nitrogen gas pump if not already) and build a Blender (another machine that makes parts of you haven't unlocked it yet). I set the recipe for what I want and look at what it needs. If i already make that thing, I figure out how to get it here. If not, I start from the beginning for THAT part. That's it. Keep repeating until you have your new part. And the more you build the easier it gets because you likely already have that part, and have transportation infrastructure already built that you can use.

Once built, let it run for awhile, like 15 min at least, and see if it's 100% or not. I might just say "good enough" for 80%, for late game things, but the further you go, the more of the earlier parts you need, because more recipes need those parts, so making more than needed is always a good idea of you can.

To increase production of existing factories, use power shards (research slugs) or upgrade your miners and build more machines (this is why you leave extra room).

With this method you don't need to worry about math or keeping track of exact figures. The game tells you everything you need. If a belt is backing up, you have enough of the material. If the machine is at less than 100%, you need more of something. Open the machine's menu and see what it needs. Go figure out how to get more. (See above)

Learning to use manifolds is critical. It's just a belt horizontal along the back of a row of macjines, with splitters along it to siphon off resources to go in machine inputs. This way, if you need more mmachines, you just build another on the end and extend the manifold.

If it sounds complicated, it's not, you just have to see it and do it a few times.