Use your Microsoft account through microsoft365.com/setup for everything you want to with Microsoft 365. Create an account or use the account of services such as OneDrive, Skype, Outlook, or Xbox Live. Use the site microsoft365.com/setup to download and install Microsoft 365 setup that will allow you to use multiple apps like Word, Excel, OneNote, PowerPoint, or more.
If you want to purchase Microsoft 365 you have to follow these simple steps:
Go to Microsoft365.com.
Choose For home, For business, For enterprise and For education.
Select your Plan and Click Buy Now.
Sign In to your Account or Create one.
Click Next, Once Signed In.
Pick a Payment Method, You can use your Credit or Debit Card.
Once the Payment is successful. Your purchase is successful.