I'm not Matt, but I think I can answer
this....
Here's how I started out....
Having played and
heard questions that I liked and disliked, and having
read archived questions (this second is important for
visual, rather than auditory, learners, as I am), I
started imitating those questions I liked, and, if I
found a question I loathed, I would write a new one
with the same answer which I thought was
better.
Eventually, after writing about things which I knew well, I
started branching out into things I didn't know.
Some people start out writing easy...some people start
out writing too hard (don't I know!) It took me
several years to get the appropriate difficulty
down.
I think the most important thing is to write about
what you know and what you find interesting, until you
figure out your own personal writing style that you are
comfortable with.