Maybe PM is not available on the forum, I never noticed before.

I cannot help all that much when it come to MNK rotation, as mine is yet to be 60 (I'm a NIN main). That being said, the fact that you understand the concept of you job is already really good. The fact you're looking online for rotation also show you should get the hang of it in no time. Keep practicing on a dummy, once it feels like second nature, it's all about practicing while doing actual mechanics. (Ravana is getting a lot of phase skip, so it maybe not the best for practicing).

When I come to pot, people only use it in Savage, really. don't worry too much about it. And they can be expensive. If you want some just for the principle of practicing your rotation with it, there's a NPC selling "baby pot" for real cheap. Might be what you look for.