Okay, the ritual I've made for clubbing lately:
First, I have a late-night meal (10pm). Healthy stuff, lots of carbohydrates and protein. Then I turn on some good player music. Music about sex, about women, about anything that has to do with the game in the right way. I turn on this music as loud as I can, and dance to it on my own. Helps setting the right mood. With the music on, I also do 30 pushups and 30 situps.
Next thing is to drink some good alcohol before going out. With good alcohol I mean strong, sugarish liquor. I prefer this over drinking beer from the get-go, to avoid the crappy "I drank too much beer" feeling later on in the night. It also saves money

.
Then I go out, always together with friends. Entrance into the club is important, so I make sure the friends I enter with have energy and presence and that we're all having a good time when entering.
However, I am
always the leader. They follow me, even when there's other alpha males there, I'm the one who takes all the initiative.
I like to smile and just stand still for a little while in the beginning, checking out the room and all the people in there in a totally comfortable and relaxed manner. As time progresses, I start dancing a little more and bring the energy up even more. I make sure all my friends are having a good time.
At this point, I'm in party mode and we go for the girls.
Either by dancing, talking, whatever. Just approach the girls you like with the vibe you've created and all the girls will notice you and like it instantly.
Make sure that during the whole night of clubbing, you've got a smile on your face and that you look and feel confident.
Setting the mood and being prepared is absolutely one of the important elements of clubbing. Helps like crazy when going for girls.