Returning player looking for info

[dno]

Hello,
I have been away from this game for about 7 years. I heard like ff 14 u can solo most things now with trust npcs but I have a few questions.

1. Smn is my favorite job I think I have to start a new character so how hard is it to get all the avatars again?

2. Can I use trust npcs in the avatar battles?

3. What would be the fastest plan for a new character to get all the avatars solo and main smn?

4. If I start a new character it should be the subjob of smn so which job should I choose for that?

Thanks so much for the help!