Gst registration as a freelancing travel consultant or tour operator or event co ordinator

For last 3 yrs, am doing concierge services related to tours & travels / Events.How can i call myself and more importantly register under GST.

As a freelancing travel consultant ? or Tour Operator ? or Event Co ordinator ? 

if tour operator - 5% GST ? if Freelancer or event management - 18 % GST ? Are the rates right ?

suggest / advice how can I be more professional as GST Complaint which will enable me to get corporate orders 

Thanks 

Hariharan.K