Manage Facebook login details along with my MS-SQL database in ASP.NET

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ASP.NET

Facebook-API

Hi,
I have studied the process of integrating facebook login but I've not implemented it in any of my web projects before until now. I have to use the facebook login with my existing sql server database.
All i need is the flow of data storage, I know am suppose to save the user info returned by facebook to my database, but now how do manage the passwords.
I have my database table like this, UserID (GUID), FirstName, LastName, PwdHash

1. Does facebook send any value i can use as the password or hash it on my own?
2. On subsequent login, do i load info from my database or restart the facebook login process?
3. Am i to make any change to my table to tell if its a direct site registration or a facebook login?

Any working sample material will be great, Thanks for your help..

What I have tried:

I have implemented the facebook login api fully in my app and facebook setting working fine.