Great advice from Pat . . . so the only thing I will ad is that you don't want your gig to turn into a "karaoke" gig. It is your show so don't (in a nice way of course) let your show be taken over by audience members who want you to back them as like in karaoke.

If need be explain how you do your backing tracks and play live music along with them to accompany your vocals. Now PLEASE don't take this as a knock on karaoke dj's but "the ones I have met" could not name 3 chords in any given song if their life depended on it. So if you are using BIAB to arrange your playlist and playing an instrument (either voice or hand held instrument) in my book you are already separated from the average karaoke dj.

But as Pat has already pointed out do not get mixed up in what to call your act, just do it to the best of your ability and of course HAVE FUN!

Break A Leg!

PS: Just curious as to what setup you will use i.e. PA? Speakers? Mixer? etc. etc.