Customization of aspnet identity provider for authentication

Question

Hi, I have few questions regarding web development using .NET MVC, my site is basically a large data bank to find records 

1- what is the best architecture i can follow for the web site development  , what are the pre-existing modules available I can use like for login and other stuff

2- I am using Asp.NET identity for authentication purposes i want to ask few questions about it like is there any way i can import aspnet identity tables to my own custom database and use them from there ?

3- can i customize this method 

await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);

as i need other parameters too like usertype,Active status etc 
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Thanks in advance