To all grand master in this game, really need some advise. Im playing this game for about 3 week and currently at lvl 65 with about 32k BP. One problem i keep encountering is about the character to use hence feels that im spending unnecessary money to keep buying characters which i dont really use.Have the below questions that needs help:

(Im using wm, sage naruto, jonin minato, mask man most of the time for my team.)

1. What is the best team to use for wind main？(i will try my best to piece them up if i dont have them at the moment)

2. What are the must have characters for wind main so i can get them when i see them in events.

3. I currently have 4 star sage naruto but for this week event, im able to get nine tail chakra naruto to 3 star and will be able to exchange the points to make it into 6 tail naruto. My question is that is it worth it to make it to 6 tail or should i just keep using sage naruto and use the points to exchange other character like edo dedaira or kisami?

4. currently there are a number of mask man and jonin minato event, im at 4 star for them too but wondering if i should max them to 5 star. it seems jonin minato will be replaced by hokage minato when it come out so wondering if its worth it or not. As for mask man, is it worth it to make him 5 star if its not part of the best team for wind main?

5. This week event have sailor sakura too, should i get her to 5 star too as i see alot in forum that she is op or it will be a waste? (didnt really use her till now.）

Would really appreciate advise on these. Thanks