Planet optimization

I've got a few hundred hours in Stellaris...but haven't looked too much at builds.

How do you optimize your worlds? Let's say you've got a forge world. Exactly what do you build, when do you build, etc? Granted a lot of this seems pretty "obvious" for the most part, but I want to know how people get high production on worlds early to see if there's things I can do to improve my own play.