Denon makes good gear. Something to keep in mind is that no matter what you use if it’s not a 1200 you’ll get hated on by old people, ignorant people, other DJs, whatever. No matter how good you are, there will be haters. I like controllers, and even just a soundcard and laptop keyboard-only, but I actively mix on turntables, controllers, CDJs and anything else I can get my hands on so I’m never bothered by critics. The MC4000 is one of the better controllers money can buy so definitely start with that and get as much experience as you can. Hopefully you young people can finally dispell all the laptop DJ hate.