After unboxing and setup genpower 305 will not start

Hi and welcome to FixYa, I am Kelly
The generator has a low oil level sensor. Make sure the oil level is FULL all the way to the point oil comes out of the oil fill port when you add oil. If after your sure it is full of oil it still does not start then disconnect ONE wire from the oil level sensor and check for spark.

There is a model number on a data plate that begins with "PM" like this:
PM0435005

This model came as a manual and an electric start so the model number is important. The engine on this model is a Subaru engine and my experience with Subaru engines it that the low oil level sensors are extremely sensitive to even the slightest drop in oil level. (Good engines though!)

There should be a fuel selector that you need to turn ON and a Choke lever that you PULL and then push in upon start.

This should be and EH34 or EY34 engine.
Thanks for choosing FixYa,
Kelly