Part 1 Creating Simple CMS with codeigniter| How to create Login with session

[eluser]Unknown[/eluser]
Hello all i'm a newbie i'm planing to create my own simple cms but for the first step i need to create my own login database and then create login form for the administrator so is any one in here have any suggestion about user login database and the code pls help me.

i'm realy serius in ci. but i don't have mentor in here. Pls some body help me.
and with for my next question.