Some questions about immigration application

Hi everyone
I've just finished 2 years education. And i'm planning to apply for permanent resident by federal skilled workers way. I've read through everything in cic.gc.ca web page. But i still don't understand about somethings:
1. Do i still need to send the medical exam and police certificate? In cic.gc.ca they just require those things for visitors ( who haven't been in Canada yet). I'm living in Canada now, do i still need it ?
2. They ask me to provide family members. Does that mean i have to provide my mom, my dad, my brother profile? What does family member mean ? I'm still single, and some people ( they are students like me too) told me that it means my wife and my baby only. It kind of confusing me.
3. And the LMO, do i still need to apply for it ? I'm employed now, and my boss can give me any offer letter needed to apply permanent resident.
I hope some one can answer me these questions before i send my applications to buffalo visa office. Thank you every one