Hey!
Welcome to the IFC! I love your eagerness to learn :)
The best resources i can give you is the following:
Furthermore, if you would like to control on expert server in the future, I would recommend making an ATC tracking thread. Pilots will come to your airport and assess you with feedback! You can learn how to make one below plus the other information.
You can also look at the ATC requirements and see if you meet them on IF-ATC.com and follow the instructions listed there!
Hopefully that helps. It’s a lot of information to take in however it becomes second nature once you practice it :) Let me know if you have any questions.