FL-Studio has become one of the BEST DAWS available now. It had humble beginnings, but has flourished in advancements over the years. On version 10 now, Image Line Software has created a powerful DAW for those that want to utilize both loops, synthesizers (VSTs), AND Live Recording. (and No, I do not work for Image Line or affiliated in any way.. - Though I would def. entertain an offer, hint hint :-)... )
I used FL-Studio extensively years ago and made a lot of progress, though at the time it had some limitations (As in, the beginning versions seemed to be a lot about the pre-recorded samples you had access too, which were not great), but I really enjoyed using it for producing music. I have recently gone back to FL-Studio and cannot believe the power it has now (and, like I said supports LIVE RECORDING very well, and track placement..).
You would also not believe how many chart toppers there are today that FL-Studio played a major part in.
As far as the learning curve, and finding help on how to use the software... The learning curve is Pretty Steep, but falls off pretty fast... I just learned it on my own, playing around with it. Once you get into the software and start constructing your music, the best you can, before long you will be amazed at how far you have gotten with the program. As you mentioned, there are not really any official learning materials out there. This program is all about just jumping in and 'messing with stuff' till you figure it out... And in reality, the hard part is the art/creativity.. the rest is just technical things you will learn over time with trial and error..(as with anything).. And, YouTube (as well as resources like Stack) is a Great place to find all you need to know to use it... The rest is up to you.
Give Fruity Loops a try. And, as I mentioned, just Jump in there, Mess around with things, and Do The Best You Can... Leave the rest up to your creativity...