How can I access App Store and iCloud after losing my iPhone 11?

Re: "I lost my iPhone 11"

Wondering if you have "Find My" turned on before it went missing ... if so:

Sign in to Find Devices on iCloud.com - Apple Support

Eg: saus:

"You can sign in to Find Devices on iCloud.com to locate a missing Apple device, even if you’ve lost your trusted device.

Sign in to Find Devices on iCloud.com

1. Go to icloud.com/find.
2. Sign in to the Apple Account you used to set up your device for Find My.

If you’re asked to enter a code from a trusted device

• If you go to icloud.com and sign in to your Apple Account, you may be asked to enter a code sent to a trusted device. To continue without entering a code, click the Find Devices button at the bottom of the window.
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Note: You should set up multiple methods of verifying your identity in case one of your devices is lost or stolen. See the Apple Support article Two-factor authentication for Apple Account."

If needed: More info. on how to: Use Find Devices on iCloud.com - Apple Support

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Re: "i want to access my apple store account and icloud"

Your Apple ID is the account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.

If you have forgotten your Apple Account log-in : Is usually an email address, (a phone number in some countries)

See what to do: If you forgot your Apple Account primary email address or phone number - Apple Support

If you have forgotten your Apple Account password: see if you can reset it online

You can log=in to the App Store, iCloud, and other services using your Apple Account ID and password.

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If you don't have a new device, see if you can log-in to iCloud online using your Apple Account details:

See how to: Sign in and use iCloud.com - Apple Support

For a verificattion code: If needed: See if you can get a verification code sent to your email address.