Yeah, I'm still using FL Studio. I actually don't even have a keyboard (although I've been toying around with the idea of buying one) - I do it all straight through the program. At the very start I just kind of played around with some default plugins, in particular the GMS Synth that comes with the program, and just tried to make some tunes and/or rip off other tunes that I liked. I made quite a few little doodles that never really went anywhere before I actually finished making a track and learned a lot through those, I'm pretty sure I have them laying around so I could upload a few if you're interested to hear what things initially sounded like (spoilers: mostly pretty bad).
Generally speaking, if there's something specific you want to know how to do, chances are there's a YouTube video for it. It's very worth watching a few basic tutorials before you get started for real and try to follow them as they go, because there's some really essential stuff there, although I can't quite find the one I used myself anymore.
As for what it's like to make the tracks... it varies a lot. I actually got burnt out for a year and a bit and just got back into it recently, but back when I was making music regularly, you'd get some tracks where I just put down an idea and got a track out of it over the course of a weekend, and some where it took the best part of a month of screwing around with various configurations of things. This one was a lot of screwing around in its DnB incarnation, followed by a few days in its current form, followed by a year of leaving it as 'unfinished' before I decided I was actually done with it.
Usually I start with a melody or pad in the background, and then add percussion and bass, then try different configurations of stuff and try adding in instruments/effects where there are gaps that need filling, while getting some kind of idea of where I'm headed overall. For the sake of demonstration, for the track I'm currently working on,
here is the original track with the melody idea, and
here is a current WIP (fairly near completion) version. You can see how the main melody hasn't changed much, but many things about it have been tweaked and a lot of extra things have been fitted around it, variations have been made to accompany other things, and so on.
I dunno if this really answered your question, but feel free to ask away if there's anything else you want to know. :V