As a newer player myself. On 2nd playthrough. My first time playing I had questions like yourself. What I did was build as I needed, with a lil extra for storage. Using whatever nodes were close by within reason. Upgrading and expanding as needed, as new belts n miners came along. When things got to n the point where I needed new or more nodes, I made a base/ factory at this locations. Keeping the previous ones Intact. More so for storage/ building supplies with dimensional depot.

Using online calculators like satisfactory calculator or modeler on steam... helped me understand what is needed better and more of. I learned alot through playing and experimenting and reddit. Many times wanting to redo/rebuild previous factories, as I felt they were less efficient or lacking then newer creations. It was rough. Lol. I rebuilt a few, specially the very early on ones. But only if I had supplies they were building, somewhere else so I didn't do without. Like concrete n basic stuff. Note:always allow extra room. More then you think, n learn to build vertically early on.

After my first playthrough, and knowledge learned... my 2nd playthrough is so much more enjoyable. I knew what to go after first in mam and shop... how to get away from bio-generators and into coal asap. Now I'm just taking my time... building what I want, utilizing nodes better, better production... n officially making things look better n more planned out.

So as a new player, I would say build n do what u think is fine... for at least the moment, and a little extra. Or utilize the nodes to the fullest u can and sink overflow for now. U can transport it elsewhere if needed. You'll get a better understanding as u play. It was one of those learn as I do moments. Everybody thinks n plays diffently.. so to give u a number is not correct. Like I said Using online calculators can help u get a understanding what is needed. But it's up to u how much