M i suppose to pay a company or work for free for...

the worker cannot suddenly terminate the employment contract. Otherwise, the employer has the right to request compensation for the unlawful termination of the employment contract, which is a compensation of no more than a month and a half salary, with a maximum. Also, the employer can request a ban against the worker.
Here is the text of the UAE Labor Law related to your inquiry:
Article (116)
If the contract is rescinded by the worker for reasons other than those stipulated in Article (121), the worker is obligated to compensate the employer for the loss that he sustained as a result of the termination of the contract, provided that the compensation amount does not exceed half a month's wages for a period of three months or the remaining period of the contract, whichever is shorter And all of this unless there is a text in the contract that stipulates otherwise.