How much are these comics worth?

how much is a first issue of DarkHawk Dawn of the DarkHawk worth, its in perfect condition. How much is a Firestorm the Nuclear Man worth, its not a first issue. How much is an issue of Deathlok The Demolisher worth, not a first issue. How much is Spawn worth, its not a first issue. How much is Robin Plus Impulse first edition worth? How much is Wlliam Shatner's Tek World worth? also not a first issue. They are all in great condition.