Pretty much everyone here is answering the question if you were god how would you create the
earth, which is a very interesting question for people to ponder, but it rather misses the mark of creating the universe. We are but a very,
very small part of it, and depending on how you look at it, creating the universe would either be far more interesting and impactful, or far
less interesting.
The universe (as far as we understand it) began with the big bang and a startlingly small number of parts. Pre-standard model particles were arguably less numerous and less complex. The interesting things in the universe are a product of
emergence and it would sort of be impossible to do anything to meaningfully effect those - god or not - once things have run their course. Essentially, if you were god and wanted to create the universe as you want it to, you would need to set the
initial conditions of the universe (a chaotic system subject to the
butterfly effect) and to get what you want, you sort of need to know what is going to happen beforehand. The universe is infinite, and assuming you're all knowing and all powerful in order to create the universe as you see fit, doing so would seem rather... boring, since you'll be able to know everything already. It's almost like "what's the point if you know the end result?". It's a catch-22, you either know everything in order to create the universe as you want and thus would already know the end results, or you don't know everything and thus can't really create the universe as you see fit. Particularly for complex conscious life (the current furthest along known end of the emergent property chain, and ergo the hardest to control for based on setting the initial conditions) you couldn't really do it.
Based on this I would hazard to guess a intentioned purpose god who creates their own universe would be painfully... bored.
I'd rather make my own solar system. Which, I have actually done already a la world building. I would
love to actually go in and see it in person. How enriching that would be...