I have salesforce community (salesforce site) and have to index that site by google.

1. How can I index my site by google?
Ex:- https://Mywebsite.com/

2. I have to allow few pages only(not all pages), how can I do this ?

3. I have some user profiles which is a public page. it can be with query string parameter. How to index those user profiles by google ?
Ex:- https://Mywebsite.com/apex/UserProfile?id=001K000000sLyjhIAC

This id will be changed based on the user profile .