kolibrizas 12 Junior Poster in Training

I am new to cron jobs and I never had an opportunity to try them. I know that they can do things in the future, so here come my questions. I am going to put my hosting in byethost.com, but before that I would like to know whether:
1. i can set a cron job to execute a script only once on a specified time?
2. i can "create a job for future" by php script?
3. can you give me an example of how a cron command looks like?

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