Clubs are the just like normal life but with time running faster and inhibitions being lower.
Looks matter as much as outside except that there is no will or time to "find out" personality and social convetions are lower therefore you can really behave as your impulses suggest.
What does it means? it means that you present yourself to a girl (how you look) and in a matter of seconds you get your answer plain and simple.
It helps to have good social skills and read body laguange to understand her answer but as a rule look plays the key role there (body-face-clothes-attitude).
Trying to buy girls with drinks or "running game" dont work most of the times, girls there are either looking for fun with some guy they find attractive or enjoy the night with friends and no be bothered.
Only once you get the girl some other factors come into the equation like game since you have to win the green light from her friends and face possible contenders.
Sure many suggests to use pick up lines or fake status or make yourself be seen with attractive girls but in the end it all depends to the first an only shot you get the in the beginnin, the look test.
First tip I can give you is be in shape, take care of your face and dress good.
Second is to chose the targets with method, I could write a book about it so too long to list
Third is to plan what to do from the moment you sense interest to the moment she gets naked in your house, this involve possible c0ckblocks and contenders plus some sh1t tests according to how much she likes you.