diff --git a/common/defaults.tf b/common/defaults.tf
index cd94076..8fe66f9 100644
--- a/common/defaults.tf
+++ b/common/defaults.tf
@@ -1,4 +1,6 @@
 locals {
+  vpc_id = data.aws_vpc.vpc.id
+  subnet_ids = data.aws_subnets.subnets.ids
   # Portfolio ID is required - must be provided via var.portfolio_id
   portfolio_id = var.portfolio_id
 
@@ -16,9 +18,22 @@ locals {
   # Use provided path_id or default to latest
   provisioning_artifact_id = var.path_id != null ? var.path_id : local.latest_artifact_id
 
-  # Merge default parameters with user-provided parameters
-  default_parameters = {}
+  # Build default parameters from module variables
+  default_parameters = {
+    ProjectName      = var.project_name
+    VpcId            = local.vpc_id
+    AZName           = data.aws_subnet.subnets[sort(data.aws_subnets.subnets.ids)[0]].availability_zone
+    InstanceType     = var.instance_type
+    OSName           = var.os_name
+    Creator          = var.creator
+    ContactEmail     = var.contact_email
+    IncPocEmail      = var.inc_poc_email
+    RequiresBackup   = var.requires_backup
+    PowerSchedule    = var.power_schedule
+    FISMAID          = var.fisma_id
+  }
   
+  # Merge defaults with user-provided parameters (user params override defaults)
   parameters = merge(
     local.default_parameters,
     var.parameters
@@ -30,5 +45,6 @@ locals {
       key   = key
       value = tostring(value)
     }
+    if value != "" # Only include non-empty values
   ]
 }
diff --git a/common/outputs.tf b/common/outputs.tf
index 23dfbe5..da95dd3 100644
--- a/common/outputs.tf
+++ b/common/outputs.tf
@@ -47,3 +47,18 @@ output "provisioning_artifact_id" {
   description = "The ID of the provisioning artifact used"
   value       = local.provisioning_artifact_id
 }
+
+output "vpc_id" {
+  description = "The VPC ID where the instance will be provisioned"
+  value       = data.aws_vpc.vpc.id
+}
+
+output "subnet_ids" {
+  description = "The subnet IDs where the instance can be provisioned"
+  value       = data.aws_subnets.subnets.ids
+}
+
+output "availability_zone" {
+  description = "The availability zone of the first selected subnet"
+  value       = data.aws_subnet.subnets[sort(data.aws_subnets.subnets.ids)[0]].availability_zone
+}
diff --git a/common/variables.parameters.tf b/common/variables.parameters.tf
index 92e9357..23f6da2 100644
--- a/common/variables.parameters.tf
+++ b/common/variables.parameters.tf
@@ -3,3 +3,57 @@ variable "parameters" {
   type        = map(string)
   default     = {}
 }
+
+variable "project_name" {
+  description = "Project name (ProjectName parameter)"
+  type        = string
+  default     = ""
+}
+
+variable "creator" {
+  description = "Creator's JBID (Creator parameter)"
+  type        = string
+  default     = ""
+}
+
+variable "contact_email" {
+  description = "Provisioning user's email (ContactEmail parameter)"
+  type        = string
+  default     = ""
+}
+
+variable "inc_poc_email" {
+  description = "Incident POC email (IncPocEmail parameter)"
+  type        = string
+  default     = ""
+}
+
+variable "instance_type" {
+  description = "EC2 instance type"
+  type        = string
+  default     = "t3.small"
+}
+
+variable "os_name" {
+  description = "Operating system version"
+  type        = string
+  default     = "RHEL9"
+}
+
+variable "requires_backup" {
+  description = "Backup requirement"
+  type        = string
+  default     = "no"
+}
+
+variable "power_schedule" {
+  description = "Power schedule"
+  type        = string
+  default     = ""
+}
+
+variable "fisma_id" {
+  description = "FISMA ID"
+  type        = string
+  default     = ""
+}