"I myself Naresh" as an introduction

No normal native speaker would say any of those. It would be 'I am Naresh and the topic . . .' or 'My name is Naresh and the topic . . .'

"Myself Naresh", is typically used in India and by (sadly) a large section of people who have picked English along the way and who definitely lack an intimate knowledge of the language. I still have to meet someone who knows the language well and introduces himself thus.

As Barrie pointed out, the correct usage is, "My name is Naresh..."

All three are problematic, for different reasons.

The first and the second sound like enumerative lists gone wrong:

I, myself, Naresh, and the topic I am going to present went into a bar …

In other words, it sounds like you have four people involved: there’s you, there’s yourself (logically the same person), there’s Naresh (presumably also the same person), and then there’s the topic you’re going to talk about. Which isn’t a person.

In other words, the first two make no sense.

The third is not ungrammatical or even unidiomatic, but it is contextually wrong.

This is Naresh

– follows a pattern very commonly used to identify yourself—on the phone. A presenter about to give a speech, on the other hand, would never introduce himself thusly.

To me, by far the most natural way to phrase this (and the way I’ve heard most scholars introduce themselves when presenting) would be:

My name is Naresh XYZ, and (today) I am going to talk about …