The easiest "DAW" to use is definitely NI's Maschine.
I isn't a real daw but with the recent ability to host plugins it is actually everything you need.
In combination with Komplete 8 it is a killer set capable of nearly everything.
and the best part is 99% of the time the track is already properly mastered.
note: you don't actually need the maschine hardware.
you also asked about the steps to make a remix:
Just look around on the internet to find remix competitions, then you will also find stems.
stems are pieces of the tracks.
with a bit of puzzle work sometimes you can even create the original by putting the stems together.
With Maschine remixing is very very easy, you can use the stems in the same way as kicks and snare, you pick the place you want them to start and they start playing.
just make sure the BPM is correct.
here is a remix I made yesterday and I'll tell you exactly what I did.
(I will upload a new version though this one has a crackle in it)
- first I figured out what the BPM was, then I figured out how many beats each samples was
- made some drumlines
- picked some massive bass and lead presets which sounded awesome and tweaked the hell out of them.
- the first minute or so of the track are only the stems plus my drums, then when the stem samples end I added a sweep, a reversed crash and a drumbuild. then I introduced my own sounds.
- then after that I kinda did the first part again, only this time with a guitar on top of it and an extra subbass.
- then the break starts and I'm tired of typing xD
But I hope I gave you an idea of how stuff works.