Potassium

Hey all, I'm pretty new to Papyrus, but I know my way around the Creation Kit and I'm an experienced programmer. I need some guidance on how to make a weapon that grants on kill bonuses that stack, and last for a time period before decaying by one. E.g. On kill, a variable increases by one, to a maximum of 5. A timer is started at 2 minutes, after which the level will decay by one and another timer will be started - repeat until the variable is 0. On kill, the user is granted a max health bonus, a speed bonus, and a damage bonus - these will obviously stack with the levels, similarly to the Ebony Blade's enchantment. I'm rather clueless and I have no idea where to start. The Ebony Blade uses a hidden quest with objectives to mark the kills, but the effects are not on a timer and are permanent.