Your AWS resources are automatically provisioned in a ready-to-use default VPC that was created for you. You can configure this VPC by adding or removing subnets, attaching network gateways, changing the default route table and modifying the network ACLs.
You can choose to create additional VPCs by going to the Amazon VPC page on the AWS Management Console and selecting the "Start VPC Wizard" button. You’ll be presented with four basic network topologies. Select the one that most closely resembles the network topology that you’d like to create and choose the "Create VPC" button. Once the VPC has been created, you can begin launching Amazon EC2 instances into your VPC.