If you already have Office, you can find your Office apps in Windows 10 by typing the app name in the search box on the taskbar. For example, type word in the search box on the taskbar and then select it from the list of results.
To transfer your Office from an old computer to a new one, uninstall it from the old computer first. Then install it on the new one and use the same product key when you're prompted for activation.
Note that Office 2007 and earlier aren't compatible with Windows 10.
If you don’t have Office yet, we recommend starting with a free trial of Office 365, a subscription that includes the Office apps, subscriber-only features, and online services like 1 TB of OneDrive storage.