Congratulations!
Here is a PA-32 specific pre-flight checklist item for you. At the time I was flying a PA-32-300R Saratoga, essentially the same airplane.
I had pulled off the taxiway to do the pre-flight runup. I got to the switch tanks item, switched from right to left, and the engine died! I knew both tanks were full, too. I used the old maxim that if something has an unfavorable result, undo it! I switched tanks back to the right and it started right up. Time for some investigation! Taxied back to the FBO, shut down, Exited the plane and re-entered head first with my head down in the footwell.
The answer was immediately visible. The lock-out lever that prevents the pilot from selecting tanks off when selecting the left tank, is attached to the metal shroud surrounding the valve assembly. The whole shroud including the lock-out lever was loose. It was basically just sitting there. When I switched tanks, the valve lever moved from right to left to off.
I am glad that happened on the ground.
So my advice is to check the shroud frequently, and/or check the lever position carefully after switching - particularly when switching to the left.
-Skip