This Is Vitally Important For New Accounts! 

Absolutely. This series will eventually go over everything with the new player experience. This one will be sooner rather than later

Depends as done is never obvious. Something useful must always be farmed even when roadblocks occur. Lack of currency to buy event specific items is common or characters need higher levels. So have alternative farms and buying gear that will be needed in the near future. They have to be prepared to adjust to special events like new characters and especially double drops. That means temporary changes to farms as big changes are possible during them. This means preparing for May The Force, yearly anniversary (Nov 24th), and end of year game events.

As long as you do one battle in each mode with him then yes