I first give them a range of hands

then break them into value range and bluffing range

the value range for example on the flop after villain bets would be

top pair top kicker, sets, 2 pairs ,

and bluffing range would be like any 2 cards? overcards with draws and stuff like that?

trying to construct bluffing ranges for villains but am unsure how to select his bluffing range after I have marked his value
It doesnt seem right that he would bluff anything thats not in his value but idk was just asking incase someone knew