Something you can consider doing if you have a hard time learning from tutorials is to can go to hotscripts.com (look in the User Authentication section). You can find a few scripts that do what you want. Incorporate them into you rs, or use them as a learning lesson. That way you have the code right in front of you to learn from.
You can also search these forums, because this topic has been covered many many times.
Either way though, I agree with liquorvicar. You will have a hard time finding someone to just write this code for you, or give it to you without some sort of compensation.