Is service tax payable on brokerage/commission?

Dear Sirs,

I am looking out to start my own business as a broker/commission agent to certain serviced apartments/hotels.

My income will be based on the number of confirmed room bookings as a certain percentage of the rent collected through my referrals.

None of these properties will be paying me a salary or any other fixed income whatsoever.

Now, my question is - will I have to pay service tax on such income received and if so under what category - "Business Auxiliary Service" or "Travel Agent" or any other category? And what is the percentage?

Please help.

Thanks.

Prakkash Loganaathan.