Apple Watch help
How to set up Apple Watch without the previous owners information
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You can't. The watch is in Activation Lock to prevent lost and stolen watches from being used by others.
Only the original owner can remove the lock. That watch is useless to you right now.
M1 Mac mini, macOS 12; Watch, series 5 GPS/cellular, watchOS 8; iPad Pro 2nd Gen, iPadOS 15; iPad Air 2, iPadOS 15; iPhone 12 Pro, iOS 15; TV 4th Gen, tvOS 15; HomePods, audioOS 15 and Airport Express w/ Airplay 2