Hi micke224,
Thanks for using Apple Support Communities. It sounds like you have questions about purchasing an iPhone. I’m happy to help.
When you purchase through the Apple website, you need to already have an active plan with your carrier, or you would need to purchase the SIM free version,
“We’ll work with your current carrier to activate your new iPhone so you can keep your existing number and rate plan. To activate with Verizon, you’ll need your four-digit Verizon account PIN.”
Buy iPhone SE - Apple
If you’re starting new service with Verizon, you’ll want to contact them to set up your account first. For additional questions, contact Apple Online Sales Support:
Contact - How to Contact Us - Apple
Take care.