You can create a project, and you will be given API keys.
Edit setting for reading/write permissions.
Generate access tokens
Then program your first Twitter bot; the website gives simple instructions using which you can create your first bot to perform specific actions.
The latest update on the Twitter deal?
The twitter deal is on hold due to spam/fake/bot accounts data submitted, in which Twitter says spam accounts are less than 5%. However, failed to prove it when asked by Elon. Where he feels spam/fake accounts are more than 20%.