I second the midi keyboard being a good investment even if you don't play. Even just being able to trigger your instrument sounds as you are browsing or tweaking make it worth it.

I myself use Cubase, Maschine, a hardware DAW controller (MCU)

Reaper is by FAR the most cost effective full function DAW ($60). It has some quirks but it doesn't lack many features.

Advice: Have fun and keep your dj setup. If you have a passion for music, keep it. Producing can be very frustrating at times, and slow to progress.. so just make sure you have fun and when you are up on a brick wall go to your dj setup and jam out and have fun with it.