Creating AWS Route 53 dns record using terraform module

Terraform Providers AWS
1

Hi Community out there,
I am newbie to Terraform, trying to create dns record but struggling how to set IAM AccountID, IAM user name and password.

Basically created three files name as : hostedzone.tf, route53-record.tf, vars.tf
hostedzone.tf

resource "aws_route53_zone" "dns-record" {
  name = var.dns-record
  comment = "${var.dns-record} public zone"
  provider = aws
}

route53-record.tf

resource "aws_route53_record" "dns-record" {
  zone_id = 
  name    = ""
  type    = "A"
  ttl     = "300"
  records = [""]
}

vars.tf

variable "AWS_REGION" {
  default = ""
}

variable "dns-record" {
  default = ""
}

Thanks !