I can help you choose the right version of QuickBooks for you, @lailak-flower199.
We have three available versions of QuickBooks Online that you can choose from. You can check this comparison chart to see which plan is right for you.
QuickBooks Online is cloud-based and accessible on all your devices. All you need is a subscription and an internet connection to access the account.
Once you already have the account, you can check these articles to help you get started with QuickBooks Online.
I'm always here if you need more help in selecting the right account for you. Take care and have a wonderful day!
You may open a QBO account
then if your company is a SaaS one, explore this billing app to integrate with your QBO account.