Can I just go up to a random girl and chat to her or do I need some sort of excuse?

nah. just go for it. It's normal to want to be sociable

help me? http://answers.yahoo.com/question/index;_ylt=Ait77xZ0HngsCXqjh9qBQq7sy6IX;_ylv=3?qid=20090623135215AANlT9A
 
The secret to starting any conversation is QAC (question answer comment).

To start a conversation, ask a question. like, "how are you"? Whatever the answer, make a comment on it. If she doesn't ask you something do it again. If she does ask you something - answer or comment. It';s easy once you've tried it.
 
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