I know that you inherited this pond, but that is pretty small, esp. if you want fish. Assuming it's a preform.....? Have you considered going larger? It's not a necessity, but in many ways, larger is less work (esp. maybe not having to move them indoors), and it's easier to keep a larger body of water "balanced," as I'm sure you know, being a fish hobbiest. Most of us here have LEARNED that ponding is an addiction -- not joking, either -- and as soon as you get that first pond up & running, you're ready to expand, LOL!
Goldfish would take care of mosquito larvae quite well, but they do grow and they do reproduce. Not familiar with mosquito fish, but if this is going to be mainly a garden pond, they might be a good choice over GF as they would stay smaller.
When you get everything up & running, be sure to post pictures -- we all love to see pond pics!