XBOX on Line MP???/

[SEE]

Had my first go today (got my butt blown away and well kicked!) great fun in all modes but can someone fill in the gaps for this on-line newbie.......

1. When a session ends do you have to start all over again by searching for new game?

2. What is the last column for? (The first is Team, second looks like headset connected, Player info but the last one not sure of)

3. Is the delay when using a headset normal? I can hardly hear anybody and I chat away with no response, as if they can't hear me)

4. What is a 'ranked match' and how is it different to a 'player matched'?

5 Where can I get info on how to add and look out for other members using the 'Friends' facilty.

All help gratefully received and looking forward to more ass kicking.....unfortunately will be mine...