I tried /flirting with the dummy but nothing happened. Should I try another one?

Seriously though, dummies are okay for testing a rotation, but they won't teach you much. I'd start by pressing P to open the spellbook and going to the "Core Abilities" tab. That'll show your trademark spells that should almost certainly be keybound. If you follow the instructions on that tab, you won't be great, but you won't be terrible either. Once you have that basic rotation down, go to Icy Veins or a class-specific site like HowToPriest for further guidance.