Got this over at TZ from Kev!n:
A quick run-down of how everything works
RANKED MATCHES
You go to "Ranked Match" and choose from either "Start match" or "Voice chat." if you've hit "ranked match," you'll pick your character and it'll find a player...nearest you, I think.
After the match, you have "Character Select," "Player Profile" Save Replay Data" and "Return to online Mode Menu" as your choices
PLAYER MATCHES (non ranked)
You hit "Player match" and have "Quick Match," "Custom Match" and "Create Session" as your three choices
CONFIRM INVITATIONS
...just hit this and accept any invites
DATA UPLOAD
Click, and you have "Replay Upload" and "Ghost Upload" as the two choices
Ghost Upload- Click, and it'll have the characters you've used here already. From here, you can CHOOSE to upload your ghosts if you wish
DATA DOWNLOAD
"New Replay List," "New Ghost List" and "Friends List" are the choices. This one's confusing, but I THINK you have the choices to download the newest-added ghosts and the ghosts your friends have in the section
LEADERBOARD
-Battle Points
-Rank
-Scenario Campaign
-Time Attack