enemy script and destroy

Hello

For my game i have a troll that is attacking me, i have already made the animation for the the swinging troll axe but how do i make the animation repeat? How do i make the troll attack me and when the axe hits me 3 times i die and start over and i have to attack him again? and what is the destroy script so that by attacking my troll 7 times with the destroy script it dies, and when i press the destroy key an animation plays and targets the troll. i know i am asking for a lot but please help i would really appreciate it i do not know how to script and i am on a time limit for my I.T project so i can not learn scripting yet

Thank you Aman