Microwave Plasma source CST Simulation

Hello guys, so i am working on a project which i have to simulate several microwave plasma sources and analyse their electric fields to see which source will produce the best plasma, the problem is a am unfamiliar with CST and i do not know where to begin. the type of plasma sources that have to be created are a microstrip, split ring resonator, and a coaxial resonator.

Thank you for the help in advance