Sorry I can't, I'm not personally experience on making Custom Classes, Although it if Team-speak is a good place to start if you want to begin using it you can use this tutorials:
----------------
If you want to start with making a custom class, Head down to 'Administrative' Section on the forms. https://gyazo.com/d9f02d1efbc15f1594feaf2c5371e063
Click on 'ImperialRP' and click 'Begin new topic' When making your custom class use this format, and read this FAQ, This will answer ALL questions you may have regarding Custom Classes
-FAQ
-Format
If you have any other questions, Please speak to support member, and Install TS3. I'm not personally experienced in making Custom Classes