Don’t get me wrong, but you will have to read up on this a lot more, before you decide what to do. 
This is an essential part of your installation, you’ll likely stick with the system you choose now for years, so be cautious. I know, not what you wanted to hear, but trust me, you will want to give some more thought into this. 
The examples for the different includes are in the first link I posted above.
It all depends on how you want to work from now on. That’s why I suggested packages. But this is your decision to make, not mine. We can help in implementing whatever way you choose, but you have to choose one upfront => you need to know at least the basics about splitting up the config or using packages.