The below diagram show the serpentine belt arrangement for a 2002 Dodge Ram 1500 5.9l.
Such a diagram is usually found in the driver's manual of your car. If you have lost the manual, there are several places online where you can download a copy of ask for help. The diagram above was found on fixya.com, a general site for people seeking help with any electronic or mechanical problem.
Other sites you could try include serpentinebeltdiagrams.com which as the name suggests, deals exclusively with such diagrams. If you prefer some advice instead, try 2carpros.com, or if you'd like to deal with fellow Dodge Ram drivers, go to dodgetalk.com or ramforumz.com.
These are online forums where you can post a question asking about serpentine belts for your 2002 Dodge Ram.
You can always find a few tips on YouTube for car repairs. This films shows how to replace the serpentine belt on a Dodge Ram: