I am quite new to speedruning Portal Revolution as well as Portal 2 and have no idea what I am doing. Can somebody help me set everything up correctly so that I can properly upload a speedrun?

Welcome!

You don't need much, you just need a timer, software that captures your gameplay, and the game itself. There is no SAR compatibility for this game, so you don't need to set that up.

I would recommend getting the Wakeup save located under 'Resources' as it would make resets less tedious.

Good luck!

I had all of the items listed above (timer, video capturing software, and the game) and got rejected because they needed demos.