By default module create VM with Ubuntu 16.04 x64. If you want to use some another please change it in code.
Examples for creating VM, change params and remove VM in flops.yml
After creating or changing params, module write ip adresses into the hosts.ini file If you nothing changed on VM - nothing will change in you hosts.ini
I recomend to use ansible-vault for encrypt string and save it in you vars file:
ansible-vault encrypt_string you_api_key --name flops_api_key