wow...first car? cool...makes me remember my first car...it was a '69 VW Van and it was GREAT. I sanded the front end (wonderful bug catcher) down to bare metal, primered it and fixed a couple dents with bondo, took it to good old Earl Scheib and had it painted "Butterscotch"...turned out pretty much School Bus orange instead...awk!!
But it was a blast and the guy I sold it to in 1990 is STILL driving it with that same paint job...
Have fun with your new pickup!! Keep the mods simple would be my advice. I would think a good detailing, do the full treatment on the exterior (clay bar, and all the fancy wax stuff that ya can read about here), maybe get a good code reader or even a programmer. Have the AC, tranny and other such stuff serviced (unless ya know the service history). I know this is DULL-DULL-DULL stuff but if ya want it to last now is the time to do it before the other stuff. Stuff like big tires = BIG BUCKS and also will decrease your mileage a bit...I know, I know...gawds I have become my parents in my old age!! d'oh!!
Oh, when I got my '97 last year one of the most FUN things was to Seafoam the engine...that was COOL and it sure made the engine run smoother. Search here and even on YouTube and see some great video's of people running Seafoam through their engine.