I have a model character of terrorist how can in make to animated and come near to the player and attack

I made a FPS game in which recently the zombies are enemy but we decided to change the theme now the enemy are terrorist so how can i made the character model of terrorist and put there animation which require in the model . the terrorist have weapon is knife and perform a melee attack to the player player position is fixed the enemy had to go the player position and attack on the player then player die problem is that how i make character and put the animation on it like run, hide..idle please help