A key thing to understand is that you don’t want some audio software like Adobe Audition. What you want is a musical instrument like Ableton Live or Traktor. And you are going to have to work at that instrument in order to master it, no matter which one you choose. So it is good to try a number of options, find one that you really like, and then roll up your sleeves and get your hands really dirty with it. You’ll get closer and closer to the results you want with each session.
Note that you don’t just want a Mac software app. Whatever software you choose, you want a combination of a Mac app and some kind of external controller. For example with Live, you can use an iPad app called touchAble ($25 I think) or a hardware Novation LaunchPad ($65 or so for the mini) to play. On the Mac, you basically create your own instrument with Ableton Live (by loading the mixer with audio clips, MIDI clips, audio effects, software instruments) and then you arm the global automation record and you play your instrument from the controller and Live records your playing into the Arrangement view. You want to be able to launch 2 clips at the same time, you want to be able to slide multiple faders up and down, you want to be able to turn filter knobs, and so on. All that happens on the external controller. If you use the mouse on the Mac to play your instrument, you will be very limited and it is not a very creative experience and you will get markedly worse results.
So you are shopping for something like Traktor plus a turntable controller, or Live plus a LaunchPad or iPad app.
Feeling lost at first in Live is OK. But it is actually fairly easy to learn. Everything is in one window where you can see it and gradually learn each feature, and if you choose View ▶ Info from the menus, then whatever you hover your mouse over will be explained at the bottom left of the Live window. There are many great tutorial videos on YouTube and a large community of users to help if you get stuck. Live is not setup to be easy for a new user so much as it is setup to be very fast and capable for an experienced user during a live performance, so it does require you to watch some tutorial videos and read the manual to get the lay of the land. But it very quickly stops being mysterious.
But again, try a bunch of options. Don’t rush into anything. You have a special opportunity to choose an instrument that you can really bond with and make the music that you’re dreaming about making. If there is a musical instrument store near you, go and try a bunch of hardware interfaces. You might find one that really feels right and whatever software goes with it is a secondary consideration.