>>46253999>how much time do I need to reroll?Depends on the available banners at the time, usually better to reroll on PokeFairs since they have better rates of 5* and usually a good focus unit.
>is Cynthia, Red or Giovanni available right now?Cynthia and Red come in their own banners so no. Giovanni yes and for free. Decent unit too.
>how scarce is the premium currency?Not too scarce, but it's always advised to reach 36.6k gems before rolling on anything as to guarantee a unit of your choice. Note that 36.6k gems for that is only attainable via 11x multi-scout.
>what should I have in mind regarding the game in general?Don't be an impulsetard and don't expect much daily content in general.