For the year 2014-15, the total service charges were below the threshold limit of Rs. 10 Lakhs and you are not required to collect,pay & register for Service Tax.
For the year 2015-16, you can claim the Exemption under Notification 33/2012 in respect of Small service Providers upto an amount of Rs. 10 Lakhs and when the service receipts crosses Rs. 10 Lakhs, you need to start charging and collect and remit the service Tax.
For Better Clarity, the position is explained below :-
1) for the year 2015-16, for the first 10 Lakhs, you need not Collect/Pay Service Tax.
2) Once the Service Charges crosses Rs. 10 Lakhs, you need to Collect/Pay service tax at applicable rates.
Alternatively, if you chose not to claim the basic exemption, you need to pay service tax from Re1.
3) For the year 2016-17, you need to collect and pay from the Re. 1 since during the previous financial year, your Gross receipts has exceeded Rs. 10 Lakhs.