The required documents after filing a labor case against an employer

Hi,

I have filed a labor case against my employer for not giving my final settlement. A month before my resignation, I agreed to pay for my training an equivalent to 10k.

I have not signed any paper about this agreement. My salary is delayed for 4 months. My only evidence is the bank transaction because they only send my salary by bank transfer.

My salary is 5k a month. When I filed my case in Al Adheed, they said I can get 30k for my 4 months delayed, gratuity, and leave pay. My first hearing is next week. I worked in the company for 1 year and 8 months.

1. Will I need to hire a lawyer for the coming hearing or Adheed will provide me with one?

2. What other things I need to prepare for the first hearing?

3. Can I ask for 3 months' compensation (15k) more since I was not able to start any job as they delayed the cancelation of my visa?

Thank you and I would appreciate your response!