Well I would recommend doing snowy village or anything before that as you can use the shrine move much as possible and kill more enemies then trying to do it on the JJK world if you want you can check my 10 tips video and goes a little more in depth with it.
Well you have to go to the evo guy and then once your there you will realize you need JJK units to get the required units so make sure to do that after whatever amount cause I don't really remember
I mean there is no best mystic for beginner because no matter what you will probably be spinning for the best character anyways so what you should go for is like itachi or sukuna those are really good units in general
Ik bruh, he the first unit I evolved and was excited to evolve him to end up having the same move sets 💀. Glad I got to see this video cause I thought it was the same with every character