Id have to agree. Going to a bar/club with a full set up booth without having ever used the gear doesn’t sound like the best idea. See if you can can get some experience first.
It’s always good to know how to play on CDJs to kill any haters who say things like “you’re not a real DJ” and the like. It’s always best to ignore these people but sometimes you just have to put your money were your mouth is and play on their gear better than them. Bear in mind, CDJs are just independent glorified MIDI controllers. No amount of marketing and “industry standards” changes the fact it’s electronic components playing an MP3.
You can easily get gigs with Traktor, lots of big names use it and lots of working DJs use it. But in reality, you could even create your own DJing software and use that because at the end of the day, song selection trumps every other aspect of DJing.
MIDI controllers do not play MP3s. That’s the very difference between a controller and a CDJ. The CDJ actually contains electronic components.
hence the “independent” part.
If the club is well run, they should have a sound guy. Be sure to check with the sound guy before you touch any of the clubs gear. If you start mucking with cables leading to the amps and such, you could actually cause damage if you cause a pop in the system. Sometimes clubs will not want you to touch the main mixer, as the system (if it’s a good one), will be tuned to sound best using their mixer.
It’s best to know what you are getting involved in before you get there, so be sure to ask ahead. Be polite and professional, of course.