Custom eletromagnets and Inductors

Coil design I need a iron nickel plated core 1in long and .25 in diameter 24awg wire 300 turns the ends attach directors flat and pointed image a flat bar you cut in half diagonal this will invert the poles as the tip of each points to the opposite end. I need 3 of them. I also need toroidal Inductors high voltage capabilities. I need 3 of them. Turns 300 to 700 and wire optimized for efficiency in induction