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My basic rule is: Once you run out of shit to say its time to close.
Think about it... its better to just close and say something like: "Well, I'm already late to meet my friends... lets grab coffee soon. Whats your number?" than to keep talking and destroy the opportunity with awkwardness.
This is THE basic rule... but keep yourself to a time constraint... say, 6-10 mins with her, topps. Utilizing small talk is a last resort and may kill/strangle your chances.
Take conversation topics from your surroundings! To help you to do this in quick time... a good practice is impromptu creative writing. Go out and sit at the park and write/answer questions about what you see. You should be able to find something funny/witty in any situation after a little time.