Look, when Instant Article Wizard worked for me, I used it to create a big tip database for each niche, so I had a delphi application that I created to generate an "article template" using a keyword and that big database. So, I'd have good info to start my articles. :-)
But now, IAW isn't working for me anymore... I live in Brazil and I guess it can have some influence to not work anymore. If it worked, my best shot to have good info quickly would be using an improved version of my tool. I planned to create a filter feature, so it'd try to select phrases talking different things, really. :-)
And if you don't want to use IAW or other tool, well, best way is identifying big informative websites in your niche. For example, if you talk about diseases, Wikipédia is one of the best places to get information - I created by myself a post database with Wikipédia disease texts, so I can read them and write my own articles. :-D
If your niche is movies, you can use IMDB data.
So it'll depend on your niche!