Complete setting up AWS/EC2/RDS server

Knowledge of setting up Magento sites on AWS a must. Will need to be able to do entire setup of AWS EC2 etc apart from DNS and possibly ongoing maintenance if need be otherwise be able to teach/document to myself in the server management and what needs doing regularly. We will need your guidance on what is required and the best way to set this up. Ideally because we have a few Magento sites we think that several instances is better than a single instance, but we are not 100% sure. This is where your input will be appreciated. We already have a S3 and Cloudfront account setup and purchased a RDS server. A previous freelancer started this project but due to health issues he could not go on but I do have the proposed architecture setup that has was going to do. You will also need to setup CDN for some of our sites and check to ensure CNAMES are correct.