First Drone Purchase: Which Battery and Charger to Choose?

Hi i am looking to buy a first drone. I am thinking about this kit https://aetherfpv.com/collections/drones/products/archetype-parts-kit?variant=43289455231059

But there is one problem. Wich battery's should i buy with them? Should i go for a 4S or 6S power system?

Wich battery loader do you guys reccomend?

Thnx for all the help