I’m not sure about the questions concerning one liners, but if you want to help on a movie or drama, etc. you just have to contact the channel manager or the moderator of the language you want to sub in ^^
I have no idea how the volunteerfinder works. I guess it’s still beta since there is no place where we can give our country and languages.
But for your 5th question: yes always PM the CM first that you want to sub and don’t forget to mentio the language and which drama. Many CM’s have various projects so if you go “I want to sub in English” the CM has no clue where you want to help.
So in short.
Look for a project. You can use the “Project finder” or just search Viki yourself since not everything is listed I noticed, I never use those finders.
When you find a project look at the community wall to see who you need to contact, then go to the volunteer tab and look for that person and send a clear PM.
Then you wait for a reply and then you can start, for any further questions you can ask that person too.
If the CM is not active for a while you can’t help it, I would just start subbing then.
I forgot to mention something yesterday: Sometimes you don’t need to PM the CM but a Moderator if there is one for the language you want to sub into. And if you see Viki is the only CM you can just start subbing because there is no team active. Unless the community wall states otherwise if there is a community wall made.
@hyolyn3221_325, Ninja Academy has a volunteer guide that explains what English and Other Language Moderators generally do in (on-air) channels. Not all channels are the same, but it may give you a better idea. You can also ask the CM what they expect of you.