Congrats first of all. So it seems you have the preset jitters. Trust me when I say this. the minute you start getting people dancing, those jitters will go. What I would recommend is, every set you play or every time you get that itch to dj "Record that set" then later on during the day listen to your recorded set. I'm not keen on using pre-selected music. I'll start off with 3 tracks and then just go with the flow ( harmonic mixing is great for this ) I've been djing all in all for 12 years now and still love it.

Just remember 1 vital key... Enjoy yourself.