1) Firstly you need to apply for the
Computer number.(apply for it ASAP)
2) Then you need to apply to sit in the exam.(this depends when you want to sit for the exam).
Application form
For the exams you can do self study or enrol to a ground school.
List of ground school is
here. (In that thread you can find all the other info. as well.)(I would prefer Surinder singh, as some of my friends said that he is really good and is getting good results)
You also need to convert your JAA FRTO to Indian.
Application form(If its commonwealth country). Otherwise you need to give exam for that.
(This conversion will give you the Indian RTR, you need to apply to DGCA after getting your RTR to get the INDIAN FRTO)
After getting all this, you can submit your documents as said in the conversion form.