There are tons of Digital Audio Workstations (DAW) to choose from. Which DAW is the best DAW is up to you. But some of the best DAWs to start mixing with are:
FL Studio 11
Studio One 3
Get to know your DAW software intimately. The savvy audio mixer sticks to one DAW and knows it truly, madly, deeply. Don’t cheat on your DAW. Stay true and you’ll reap all the benefits.
I’ll be using Pro Tools as an example but all the principles are the same no matter how you mix.