Should I simply be cool guy there and let chicks talk with me more ..... And I being laidback
This is your best route - become known as cool and fun to be around.
Got any idea about how should I game there
Very discretely - This is social circle not a pick up club. Be chilled, cool and fun to talk to. Always have good manners, go introduce yourself - most guys don't have the confidence to do this - and then ask girls to dance. Maybe use a soft opener but don't pursue hard. Ask all girls for a dance, not just the hot ones. The average and not so good looking ones will remember you much more and ask you to joint them and their friends in the future.
Remember - it's social circle - most people know each other to some degree.
Girls talk - they talk about guys - which guys are nice and fun to dance with, equally they know the guys that ask every other girl out. If you get a reputation for asking lots of girls out word goes round and all you get is no's. Girls don't want to be number 20 on your list of girls that have been asked out. Discretion is key.
Get to be known as fun, sociable, with a little bit of edginess. By all means flirt in a fun way but don't push it beyond this unless she is driving it. It doesn't take long and they will be asking you to go to clubs, dances and bars with them as there is always a shortage of guys that can dance and are fun etc. Once you start getting invitations you will meet their friends and they will introduce you so you have social proof. Then you start to open up a larger circle and pull girls from outside of the dance class. But again always discrete so isolate before any physical escalation - this doesn't preclude verbal escalations or body language, eyes etc.
Most importantly be a confident version of yourself. Even if you make a complete mess of dancing be confident in yourself and own it. That's what girls find attractive.