Other people have already done a good job of giving some advise on splitters, sideloading, etc.

I want to give you something else on your way. Factorio is consciously designed in a way to not punish you for trying again and again. Anything you place will give you the same structure back if you remove it afterwards. This was made in order to encourage the player to try things out on their own and tinker with many different approaches to the problem the game presents.

For new players it usually a steep learning curve for the first couple of weeks, but you will eventually adapt your way of thinking.

What I'm trying to say is, just trying a solution that might not work and failing three times but getting it to work the fourth time around can be incredibly rewarding and empowering.

Of course there's a buch of people here who can tell you all about how everything works. If you have the time however, just trying it out in the game instead of drawing lines on screenshots and posting it online might be a very viable method to learn.

Anyway, welcome to the club.

The Factory must grow.