2. Select any version of QuickBooks( Simple Start, Essentials, Advanced or Plus).
3. Choose Buy Now or Get a 30-day free trial.
Once done, you can start signing up and enter your email address, mobile number, and password.
You can refer to this article to see everything you need and resources for getting started with QuickBooks Online: Getting started with QuickBooks Online. This article also contains on how to create transactions in QBO.