expose infopath 2013 forms to internet

Hi

I am working with SharePoint 2013. 

Have created a InfoPath form which has 15 fields and the data is published to SharePoint Form Library. Now I want this form to be accessible through internet.

Can anyone suggest what needs to be done from the server perspective. I have one server which has IIS, SharePoint 2013, SQL server 2012, Infopath 2013 client etc..

Currently I can access all the sharepoint site hosted in this server through intranet.

Please suggest how to expose this to internet? and able to access the infoPath form through internet.

Thanks.