Hi Pam317,
Welcome to the Apple Community,
Apple support have articles online (links below) that may help.
Re: "Can anyone help turn this off".
Use notifications on your iPhone, iPad, and iPod touch
Learn how to view and manage your notifications to minimize interruptions
https://support.apple.com/en-au/guide/iphone/iph62faab6a4/ios
Change notification settings on iPhone:
Most notification settings can be customized for each app.
https://support.apple.com/en-au/guide/iphone/iph7c3d96bab/ios
Change message notifications on iPhone
You can set up and manage message notifications for the Messages app
https://support.apple.com/en-au/guide/iphone/iph62faab6a4/ios
Re: same contacts now only send/receive as text not iMessage
Send and receive text messages on iPhone
Use the Messages app to send and receive texts, photos, videos, and audio messages.
https://support.apple.com/en-au/guide/iphone/iph82fb73ba3/ios
About iMessage and SMS/MMS on iPhone:
Find out more about the difference between the message types.
Eg: To turn iMessage on or off, go to Settings > Messages.
If you're not using iMessage, you can use SMS/MMS.
(If Wi-Fi is unavailable, iMessages will be sent over cellular data. Cellular data rates may apply.)
Complete article: https://support.apple.com/en-au/HT207006
Add and use contact information on iPhone
Eg: Scroll to: "Quickly reach a contact"
Says:
To start a message, make a phone call or a FaceTime call, compose an email, or send money with Apple Pay,
tap a button below the contact’s name.
https://support.apple.com/en-au/guide/iphone/iph3e0ca2db/ios
Trusting there is something useful to you here, in taking control.
All the best :-)