It's all good! If you look on your UI, you should have a job gauge that looks like this:



When the little gems are lit up, that means you have Aetherflow stacks. :3 You can have up to three stacks at a time, and skills like Lustrate, Indom, and Excog use 1 stack per usage. The skill Aetherflow can be used every 60 seconds to give you more stacks. :3

For some more basic SCH info, here's the Job Guide from the Lodestone. ^^ Just to give you some more overview of skills and your gauges. ^^

https://na.finalfantasyxiv.com/jobguide/scholar/