Hi!
To my knowledge, you need to complete the following steps to create a conversational bot:
- Prepare your development environment.
- Create your web service.
- Register your web service as a bot with Microsoft Bot Framework.
- Create your app manifest and your app package.
- Upload your package to Microsoft Teams.
For more details, you can learn it from:
https://learn.microsoft.com/en-us/microsoftteams/platform/bots/how-to/create-a-bot-for-teams