You say you need to know what questions to ask.
I write in different phases. The first is the idea-capture phase. This one is tricky because I'm not at all sure it can be forced. Either you have an idea or not.
You can gather ideas though, and combine them, pull them apart and put them together in new ways. But they usually need to simmer... for weeks, months, even years or decades...
I need to have a basic idea of a theme, an event, something I want the book to be about... if it's a kidnapping, an invasion, a betrayal, a bank heist, a kind of basic idea or picture that I can use to work from.
Usually, this is about something I feel I want to talk about. Yes, one important skill in my writing is to avoid soapboxing and it's sometimes going so-so. I get ideas like this from reading magazines and books, and watching TV programs and movies about things I care about.
For me, interest and a need to say something is important sources for ideas on not just what the story should be about, but why.
It's even possible the idea won't survive the process but did give rise to other, better ideas. Change is always good in the early stages... well it's good later on too... just not always as welcome...
Once I have the idea I start working on it using the Snowflake Method. It's great in that it expands the story incrementally and that it forces you to look at the two most important sides of a story; character and plot.
Once I start working with the Snowflake Method the questions tend to be more pragmatic; what happens next? How do I solve this problem? What does this character work with? How does it end? Where does it start? That many catastrophes, really? Oh well, how do I create catastrophes? What bad things are going to happen?
At that level, I force myself to come up with a solution or idea or piece of text or character development, and usually, I end up with something. Not always good, sometimes I find something better later. Improvement!
It also helps to be a kind of annoying naysayer. Whenever someone says something with determination, my mind always starts trying to find holes in their reasoning. I guess this would be a version of "what if"-questioning... In the early stages, it's great to intuitively look at situations and things from different angles... in later stages, it can be a pain...
If you use the Snowflake Method you find you'll spend a considerable amount of time before getting to even write the first draft... depending on how fast or slow you work. But doing all that work with characters and plot tends to get me more and more triggered to get to the damn draft and it happens that I just start writing out of pure desperation.
So, is the first draft any good?
"The first draft of anything is shit."
/Ernest Hemmingway
The first draft is not the last draft. If it was, some bastard would edit their texts and become a brilliant best-selling author compared to everybody else because of it.
You're not going to escape editing the first draft. At least not if you want to do more than just write the first draft...
And with editing comes a completely new family of questions... how do I make them sound different? How do I make them look different? Wait, wasn't she supposed to be introverted? Well, she is here, but not here... what happened? Does it work? Do I need to change one place? Then what? What if I get her drunk? Hey! What if they're at a party in this scene? Aha!
The good news is that you get many chances to fix what's not working in the first draft. It's a bit like being able to retake a test until you get the score you like. Amazing and a bit dangerous... at least if you're aiming for a full score... and planning on getting anything out there...
So, what you write in the first draft is much less important than what you write in the last... if, consciously or not, that great white unwritten page is somehow interfering with getting the words down...
"Inspiration is for amateurs. If you have ambitions as a writer, you should just write something, anything, and then work on it."
/Jan Guillou
This quote is from a best-selling author with a past as a journalist. Several best-selling authors seem to have a past in journalism... perhaps it's because they're used to producing texts and have less romanticized views of writing as a whole. It's about words on the page that you get down, then reshape until they shine, or get cut. Or your deadline is here and whatever dungheap you have gets published...
I might also add that Guillou does not produce perfect texts, not always, and the more I write the more I find minor and major faults in them... But he has for sure published more books than I have and he's made more money than I have... and most importantly, he's been read by and is known by a lot more people than I am... or likely ever will be...