do i need to buy a set of these...like two of them? or will one be ok for rock climbing?

Have you ever been climbing at all? Like ever? I don't mean to be rude, but your question is something you really desperately need to know the answer to before you venture out on your own. To answer it, yes. You need to buy a set. When leading, you clip a draw (one of these) to each and every bolt on the way up. Again, if you didn't already know that, you shouldn't be leading at all. How many is in a set depends on where you climb, how long the routes are, how closely bolted they are, whether you feel like skipping clips (which you shouldn't), and a number of other factors, but count on needing 10 at the very least. I have 16 and have still encountered routes that needed more. I sincerely hope this was some kind of sarcastic joke, because a question like that gives me serious concerns that you will be in the next issue of Accidents in North American Mountaineering. Make good choices.
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