I am able to create an Elastic Beanstalk environment with a VPC using this command with eb-cli:

eb create --vpc

This asks me to configure several options:

Enter an RDS DB username (default is "ebroot"): ...
Enter an RDS DB master password: ...
Retype password to confirm: ...
Enter the VPC ID: ...
Do you want to associate a public IP address? (Y/n): ...
Enter a comma-separated list of Amazon EC2 subnets: ...
Enter a comma-separated list of Amazon ELB subnets: ...
Do you want the load balancer to be public? (Select no for internal) (Y/n): ...
Enter a comma-separated list of Amazon VPC security groups: ...
Creating application version archive ...

I have created a VPC with subnets and added an RDS instance to it following this thread here and here (thank you @Marcin!). But, there are a few things that I am confused about:

1. What is "Do you want to associate a public IP address?"
2. I remember creating subnets for my VPC, but what does it want me to add for the "EC2 subnets" and the "ELB subnets"? Should I add the ones from my VPC?
3. For "Do you want the load balancer to be public?", what does this exactly mean? I am assuming that public means that it is public on the internet, whereas private means I can only access it in the VPC?
4. For "Enter a comma-separated list of Amazon VPC security groups", do I need to add anything here?

I know these are pretty open ended, but hopefully this helps someone!