Just Register The Firm/ Company and Start the Business,
After One Year Of Business you r eligible to apply for IATA
By which u can issue tickets at your own.
Then you can apply for the various bodies like TAAI, TAFI, Indian Railways Etc
But IATA Is Must, You need Bank Guarantee and Min Two Certified Training Holder from Airlines or IATA

First thing you need to know local don. Travel business is mostly run by these dons or their mentors.