hey im new to weight lifting but i have been using a bench press for a week or so. So far i have been lifting weights which allow me to do multiple sets of 15 reps.

...i have enough weights to make it more difficult but i can do less reps and less sets.

what will develop muscles faster?

thanks

Are you confined to a wheelchair?

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Don't blame me, I voted for Ron Paul.

no...why?

Do 6 sets with 10-15 reps. The last 2 sets should be damn near impossible.

...and don't forget to eat what Phelps eats too.

There's a trillion routines out there.

There's sufficient evidence from research that one quality set will give you at least 90% of what multiple sets do.

There's also a large debate about working to failure versus not.

I don't know the answers , personally.

But I feel if you're going to do multiple sets, with muscle growth as a goal, somewhere in the middle or near the end, of these sets, you should do a set that becomes extremely difficult near 5 reps.
You can go beyond the 5 and work it to failure or not.
But, IMO, the weight should be too heavy to lift 10 times.

You didn't say anything about how often you squat and deadlift.

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Don't blame me, I voted for Ron Paul.

On bench I go 7-7-6-5-3-2-2 getting increasingly heavier each time and I try to put enough weight on there so I can never finish the last rep after the fourth set...