Welcome to the Club, and nice rig you have there.
I had a 19' Classic in Hydro Pearl Blue and loved her.
As has been advised, 5W30 synthetic, BioTech in the oil if not running Red Line 5W30 High Performance, and a good synthetic media oil filter.
Keep your idling to a minimum, use good fuel, and enjoy your HEMI Ram ownership experience.
These are beauty trucks!!
Spark plugs are a good start for your truck. Rock Auto and perhaps look at the NGK Ruthenium HX plugs as well.
Check and gently tighten ALL the intake manifold bolts as these are known to loosen up.
Check your fuses and seat them as they are known to not be well seated (you bought used, so not know if the previous owner did this or not).
Clean your throttle body and PCV valve.
Really good maintenance items to consider are an oil catch can, and the
@caulk04 transmission cooler bypass valve upgrade to keep your transmission temps down as our 8spd's are known to run hot.