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Get the bot's API token from @BotFather
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Create a Group
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Create a Chat channel
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Edit Chat channel Link to a Group
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Get the ID of the chat
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Test send a message using the HTTP API: https://core.telegram.org/bots/api#sendmessage
curl -X POST \
-H 'Content-Type: application/json' \
-d '{"chat_id": "123456789", "text": "This is a test from curl", "disable_notification": true}' \
https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/sendMessage