Recover an EC2-Classic Instance

Hello, I found some documentation on this type of migration here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/vpc-migrate.html

Thanks, but the problem is that I don't use AWS that often and I don't really know what to do. I can start the instance up and connect to the public IP address and connect via SFTP to it and see the file structure, but don't know if I can then connect an elastic IP to it or not. "Platform" suggests: EC2 can't retrieve the platform because the AMI was either deleted or made private. "AMI name" suggests: EC2 can't retrieve the name because the AMI was either deleted or made private. Security Group: The security group 'xx-xxxxxxxx' does not exist

Is it easier for me to just create a new instance and copy over the relevant files over to it? I think the instance had multiple sites hosted on it at one point, but I don't believe that is necessary now.