The authorized capital must be deposited into the company's bank account in the UAE within 6 months from the date of issue of the company's license. After that, you can start managing them.
The company itself determines the size of the authorized capital. However, certain activities require a certain amount of share capital, and the DMCC Registrar may change the minimum share capital for companies from time to time.
The capital requirement is currently AED 50,000.