How players will know their current level?
Your players will be able to know their current level first thing on the top of Gameball Player Profile widget.
How will players know they can level up?
From Gameball Player Profile widget, you will see under the level bar the name of the level they are on.
How will players know about how many levels and the benefits of joining any level?
From Gameball Player Profile widget, the user will click on Progress in the points card to access the levels list, and then they will see the needed action to take according to your chosen leveling up method.