1.) Pass this info in userdata while setting up instance or do this post installation.

yum update -y

yum install awscli wget ruby -y

cd /home/ec2-user/

wget https://aws-codedeploy-$(curl -s 169.254.169.254/latest/meta-data/placement/availability-zone | sed 's/.$//').s3.amazonaws.com/latest/install

chmod +x ./install

./install auto"

service codedeploy-agent restart