Lastly, I have an ethical question. I know how to get free female voice workers, but I wasn't sure if just going up and asking someone to make some sounds into a microphone without telling them what they would be used for violated any license agreements or anything like that.
I've asked myself similar questions, in particular with collaborative works when some people aren't very informed about intellectual property.
Personally I don't hide my intents, if I do that for a game, or for a music record, it's something I tell, and people get to know about my activities.
While free licenses is also about re-use, so the projects in which these resources are used can be far from the original intent.
So when I can I also clarify as much of why I like free licenses (or why I'm hostile to intellectual property).
In one case I was like the producer, and I didn't even question myself and just chose what license the content should be available. These people were kinda aware of my ideals so It's not like a big betrayal.
In other case, I was more about leaving the person chose his/her own license, though it requires licenses knowledge. In this case I also take that as an opportunity to talk legal and share my point of view, without insisting.
Have fun while doing it, seize the opportunity to share your point of view, and do not impose a free license if you feel like they wouldn't agree.
Communication sometimes is more important than the result

About "how to get a clue of what to do about sounds", you can even have an eye on Quake 3 original game.
Describing everything would be some kind of waste of time, just use different ways to get a clue (Q3 original sounds, trying and see what it gives, checking "neighbor" sounds, or just by guessing ...). What counts is the aesthetic of the final result.