Another rule:
When meeting someone you like, engage in ordinary conversation until anxiety has lowered naturally. When anxiety has lowered and emotions feel a little bit at ease, continue the conversation into a "likening state" where similar interests are in the context. Let the other person engage in the conversation as well. Remember, conservations are 60/40 or 40/60 not 80/20 or 20/80.
Another rule:
Approach slowly to the "likening state" not exciting or frustrating the person too early. Haste makes waste.
Another rule:
If the person does not seem interested, then the person is not interested. Say a warming "goodbye" or "I'll see you again sometime" then leave. Try not to think of the outcome as a failure but valuable social experience.
Another rule:
If the first social encounter went well and into the "likening state", then take the opportunity to ask for contact information. If he/she accepts, congratulations!
Another rule:
Never obsess over the contact information and flood him/her with text messages or phone calls. This is a major letdown on the relationship and will devastate future possibilities. Take it slow and remember that relationship making is a process not something that can be "obtained easily". He/she is a person not some problem that can be solved immediately.
Another rule:
Remember to breathe and relax, which is hard but can be done. Try using a mental visualization of a peaceful place like walking in a serene path with cherry blossom trees in the outer sides of the path. Anything that is colorful that soothes the senses work. This will make interacting with people go much smoother.
Hope this helps!
--berlingots