1. Message @botfather https://telegram.me/botfather with the following text: /newbot If you don’t know how to message by username, click the search field on your Telegram app and type @botfather, you should be able to initiate a conversation. Be careful not to send it to the wrong contact, because some users has similar usernames to botfather.

    botfather initial conversation

  2. @botfather replies with Alright, a new bot. How are we going to call it? Please choose a name for your bot.

  3. Type whatever name you want for your bot.

  4. @botfather replies with Good. Now let's choose a username for your bot. It must end in bot. Like this, for example: TetrisBot or tetris_bot.

  5. Type whatever username you want for your bot, minimum 5 characters, and must end with bot. For example: whateversamplebot

  6. @botfather replies with:

    Done! Congratulations on your new bot. You will find it at telegram.me/whateversamplebot. You can now add a description, about section and profile picture for your bot, see /help for a list of commands.

    Use this token to access the HTTP API: 123456789:AAG90e14-0f8-40183D-18491dDE

    For a description of the Bot API, see this page: https://core.telegram.org/bots/api

  7. Note down the token mentioned above. It’s IMPORTANT.

Ref: Telegram Bot starter kit