Well something from nothing is simply illogical, how can something happen for no reason at all. As for laws, as noted above even if laws exist there has to be something in the fundmental that is in accordance with rule following.
I don't see how it would make sense to ask how fundamentals work if by "work" we mean explaining them in terms of other fundamentals - isn't this like asking how laws would work in the physicalist ontology?
Though, for example, there could a metaphysical argument on how a fundamental like the Pure Actuality of the Prime Mover is given over, in a limited sense, to agents in Its creation. In this example the Prime Mover, who is the First Cause in the Now rather than the first point in a temporal chain, decides the final causes (telos) of non-conscious entities* allows beings created in Its image to determine - in a more limited manner - their own telos. So free will would follow from a causal model that is derived from elements of metaphysics which starts from accepting Act (Reality of what exists Now) & Potency (Reality of Possibility).
This is fine, yet still does not explain how the First Cause or derived agents make decisions.
But if the laws just describe what happens, they aren't enforcing that any cause necessitates its outcome. Which just brings us back to causes as dispositions.
And if there's a little bit of randomness, isn't this like feces in a barrel of wine - it contaminates the whole? It seems with a bit of randomness you just have a random - meanign arbitrary - universe. (Though without laws, which we know can't simply impose themselves on reality, even a deterministic universe is "random" in that it's arbitrary nothing changes given the causes always under-determine the outcome.)
What kind of law gives a stochastic average? The limiting case doesn't seem to be very coherent in a physicalist reality? Of course if the simulation is Consciousness Created, it would seem Consciousness is the "actualizer" deciding on what possibilities are made real as well as underlying Time.