Can an international student on f1 visa be sponsored h1b visa by the brokerage working as real estate broker?

I doubt if the RE Brokerage firm could offer you any job position which will be deemed of an H-1B caliber and approved by USCIS. A Master's in marketing degree is one of the worst for H-1B purposes, for it is a "general" diploma as far as CIS is concerned and not one for a recognized "profession" of H-1B caliber. Marketing positions are almost always routinely denied by CIS for not being "a specialty occupation" as required by the H-1B regulations.

A real estate broker is not an H-1B job since a college degree is not required. H-1B visas are for foreign-born professionals with offers of employment in the U.S. Over the past 30 years, our law firm has obtained H-1B visas for thousands of accountants, architects, attorneys, business professionals, computer programmers, engineers, health care workers, physicians, researchers, system analysts and other professional employees. To be eligible for H-1B status, you must (1) have a minimum of a four-year university degree or equivalent; (2) be paid at the “prevailing wage”; and (3) the job must typically require a minimum four-year university degree or equivalent.

I doubt it. People can get a realtor license with as little as a high school degree ... clearly it is not a 'professional' job in the eyes of immigration. Requirements, procedures? Start by reading the I-129H instructions.