what do i need to put 17 inch rims on my 2009 dodge ram?
17" wheels with your bolt pattern.
Regrets is right about that, but you also need to make sure the offset is correct or you might not have clearance for the brake calipers. A good tire and wheel shop can set you up with everything you need, your only other concern will be the speedo/odometer calibration, it may need adjusting after the tire and wheel switch.
If you use an online tire calculator you can get tires that will be the same diameter. If you go bigger the tire calculator will tell you how far off your speedometer is. Google "tire calculator".
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