The very first thing you need to know is what you want. That is, what do you want the song to sound like when you're done with it. Start with a "faders-up" listen to hear what you got to work with. That is, just bring all your tracks up and listen to them together at rough levels.
Then let the music inspire you. Work out a basic plan for instrument placement and song arrangement based upon what you're hearing; what parts need to be used where, which hooks should be emphasized, where you want the instruments to appear in the pan space, which ones go together and which ones don't etc.
The figure out how what you have in front of you differes from what you're imagining, and use the tools you have in front of you to make th necessary changes.
Mixing is not formulaic; it's as creative a process as song writing or performing.
Learning your tools and when to use them is also important, that comes hand in hand with developing your ear. And like glen said know what you want. Listen to a lot of music, and learn to pick out all the details.
I haven't tried neither of those products, and can't say if their good or not, however, if you are new to mixing you probably will be able to pick up some tricks and techniques.