DO: Look like you're enjoying it
Confidence is key when getting into a club. A smile and a giggle here and there go a long way. It shows that you aren't taking yourself too seriously and you are enjoying yourself and your company. Confidence is one of the most attractive things about a person. Just make sure it doesn't seem like you are laughing at whoever you're dancing with.
DON'T: Not dance on the Dance floor
If you are trying to get the attention of your friend, tell a story to a girl or guy you're interested in, or just straight up don't want to dance, get off the dance floor. Do not be that person who stands with their friends and ends up rejecting an offer to dance by saying "I don't really dance." If you are on the dance floor, you better be ready to start moving.
DO: Feel the rhythm and stay in the box
Front to back, side to side, a little bit of 'dutty wining' and you should be fine. Nothing to extravagant and no one is going to question you. Also if you can't dance, maybe just stick to the two step. Imagine a box on the floor and just keep moving your arms, feet and the rest of your body inside it.
DON'T: Overuse one part of your body
If people are confusing you for Mr.Bean, or walking past you either imitating or laughing at you, you are doing something wrong. Too much arm, too much leg, or too much hip gyrating can ruin a perfectly good dance.
DO: Keep good spacing
Spacing is so important. When dancing with the opposite gender you have to know how much space to have between you both. The first time you dance together is not a good time to be touching groins. Depending on the type of dancing will determine the space, but you should know in the first few seconds what is appropriate and what is not. Also grinding to Justin Beiber is never really a good look.
DON'T: Pull out the dance moves that were funny in infant school!
Thanks for your concern, but the dance floor doesn't need to be 'wormed' and it isn't offering anything to throw in your imaginary shopping cart. Yes, pretending to mow the lawn or do breast stroke in time with the beat can be funny at first, but can get real annoying in a matter of seconds.