Karthik,
Let us start from 1982.
1. Sangili - 14.04.1982.
First film. Remake of Kalicharan. Sort of a guest role for Prabhu as he would appear in the second half.
2. Lottery ticket - Aug 14th, 1982
This was again CVR directed film where he did a negative role. Mohan (?) and Suhasini played the lead roles. My remmeberance is his introduction scene would show a NT film poster in the background (En Magan. Irony - it was also directed by CVR).
3. Nalamthaana - Sep 24, 1982
His first role as Hero with Sankarabaranam Rajalakshmi as the heroine. Don't remember much.
4. Kannodu Kan - Oct 1st, 1982.
Here he was not the hero. If I am not off the mark, producer Kottarakara's son was the hero with Sulakshana(?) as the heroine. This is one movie, I missed out.
5. Athisaya Piravigal - 14.11.1982 - Deepavali
This Devar Films movie was the first one to showcase Prabhu as an actor and was well received.
6. Chinnansirusukal - 10th Dec, 1982.
This double hero film (Mohan being the other) along with Sulakshana was a interesting movie with Prabhu donning a rich man's role with conviction.
7. Kozhi Koovuthu - 24th Dec, 1982.
His first Super hit movie. Though Suresh and Viji were the main characters, it was Prabhu and Silk that stole the show. Poove ilaiya Poove was a super duper hit song which also showed that Prabhu can carry song sequences with aplomb.
Let me come back
Regards
Disclaimer: Not sure about certain release dates of the movies mentioned above though the chronological order is correct.