Welcome to the Club!! I just picked up my Black 2013 TRD in August and have been having a lot of fun. This too is my first time modding my vehicle. Always kept my vehicles stock.
Here is what I have done so far and I couldn't be happier!!
Bilstien 5100 front leveling kit (4wheel parts
did a great job)
17" TKO Black wheels from Americas Tire Co
285 75R 17 Terra Grappler Tires (again Americas Tire)
Changed out all the stock speakers
Fog light mod
Blacked out front grille
I'm going to take a little $$ break but my next project will be AFE cold air intake.
My brother (faryota) put one on his and is getting great Gas mileage, better HP and torque.
You have what I consider the best truck money can buy and will have many great times fixin it up to match your personality!! Enjoy!!!