Creating RDS cloudformation with route 53

I am having trouble with aws cloud formation. I need to create cloudformation that will install and configure RDS with RHEL and mariadb with route 53 and master user. I started first with basic config.yaml but i am getting an error with vpc, it says

No default VPC for this user (Service: AmazonEC2; Status Code: 400; Error Code: VPCIdNotSpecified; Request ID: 407bd74c-9b85-4cce-b5a7-b816fe7aea15)

My config.yaml is this

Resources:   Ec2Instance1:      Type: 'AWS::EC2::Instance'      Properties:           SecurityGroups:               - !Ref InstanceSecurityGroup           KeyName: adivir           ImageId: ami-07dfba995513840b5           AvailabilityZone: eu-central-1           InstanceType: t2.micro           UserData:              Fn::Base64: !Sub |               #!/bin/bash -xe               yum install -y httpd               yum install -y git               yum install -y php php-mysql               git clone https://github.com/demoglot/php.git /var/www/html               systemctl restart httpd               systemctl enable httpd   Ec2Instance2:      Type: 'AWS::EC2::Instance'      Properties:           SecurityGroups:               - !Ref InstanceSecurityGroup           KeyName: adivir           ImageId: ami-07dfba995513840b5           AvailabilityZone: eu-central-1           InstanceType: t2.micro           UserData:             Fn::Base64: !Sub |               #!/bin/bash -xe               yum install -y httpd               yum install git -y               git clone https://github.com/demoglot/php.git /var/www/html               systemctl restart httpd               systemctl enable httpd   InstanceSecurityGroup:    Type: 'AWS::EC2::SecurityGroup'    Properties:      GroupDescription: Enable SSH access      SecurityGroupIngress:        - IpProtocol: tcp          FromPort: '2256'          ToPort: '2256'          CidrIp: 0.0.0.0/0        - IpProtocol: tcp          FromPort: '80'          ToPort: '80'          CidrIp: 0.0.0.0/0   ElasticLoadBalancer:    Type: 'AWS::ElasticLoadBalancing::LoadBalancer'    Properties:        AvailabilityZones:             - eu-central-1             - eu-central-1b        Listeners:            - InstancePort: '80'              LoadBalancerPort: '80'              Protocol: HTTP        HealthCheck:              Target: 'HTTP:80/'              HealthyThreshold: '3'              UnhealthyThreshold: '5'              Interval: '30'              Timeout: '5'        Instances :           - !Ref Ec2Instance1           - !Ref Ec2Instance2   DBSECURITYGROUP:    Type: 'AWS::RDS::DBSecurityGroup'    Properties:          GroupDescription: Security Group for RDS private access          DBSecurityGroupIngress:            - CIDRIP: 0.0.0.0/0   MyDB:    Type: 'AWS::RDS::DBInstance'    Properties:        DBName: kk        AllocatedStorage: '20'        DBInstanceClass: db.t2.micro        Engine: MariaDB        EngineVersion: '10.1.31'        MasterUsername: admin        MasterUserPassword: admin123        DBSecurityGroups:            - !Ref DBSECURITYGROUP        Tags:           - Key: name             Value: kk    DeletionPolicy: Snapshot

What i need to do in order to resolve vpc error and have RDS create successfully and how and where to add route 53 creation in yaml file? Also database neds to be connected to java app athat is on other instance. What do i need to share with person making app in order for him to connect to database? Also, is it possible to have one shell script that will run cloudformations in order, create stacks and then exit so that not each team member needs to run his own cloud formation? Thank you