Want to create iCloud
how to create an iCloud account
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Create a web mail address say with gmail services https://support.google.com/accounts/answer/27441?hl=en
And sign in as Apple ID in Mac / iPhone / iPad whatever is used , make sure web mail address is kept same as Apple ID and password .
See some articles How to create a new Apple ID - Apple Support
Sign in with your Apple ID - Apple Support
You have to set up iCloud Set up iCloud on all your devices
The icloud account is set up , it can be accessed by signing in with Apple ID and password with its account credentials at www.icloud.com