Where to start (bounty datapack)

I am very new to datapacks and because I am starting a server I am thinking of making a bounty datapack that works like this : Based on your time alive you get some bounty points (ex 1 hour = 1 bounty point) , if you kill another player you get another bounty point (cooldown between kills 1 hour)  and when you die you lose your bounty . If a player kills you he gets some bounty tokens that can be exchanged for goods . I dont even know where to start and what I should learn about it  , All my experience with datapacks is some origins datapacks I made and that's all. Please guide me so I could learn how to make it