Hi, @Vee Revithi
Personal sounds like the right choice for occasional help with presentations. Microsoft 365 Personal includes Copilot in PowerPoint, Word, Excel and Outlook for the person who owns the plan.
On storage, you get 1 TB of OneDrive cloud storage for your files and photos, plus 100 GB of mailbox storage for Outlook.com email. Your Gmail storage won't change, though. Gmail space is managed by Google, so Microsoft 365 doesn't add anything to it, even if you read your Gmail in the Outlook app.
Here's what you need to do to move smoothly from the trial to a paid plan:
Go to account.microsoft.com/services and sign in with the same account you're using for the trial.
Find Microsoft 365 Personal and select Manage.
Since you turned off recurring billing earlier, select Turn on recurring billing and confirm your payment method.
If you'd rather pay yearly than monthly, select Manage > Change > Switch, then choose the yearly option. The yearly plan usually works out cheaper.
That's all you need to do. On November 23 the trial turns into your paid subscription automatically. You won't need to reinstall anything, and your files, emails and Copilot will keep working without any interruption.
After that, you won't need Bob's family plan anymore. You can leave it so he can give your spot to someone else, but it's not required.