So I've got a rocket already in space with a mass of 100 kg and I want to know how much force will thrust it to 2 km meters per second. That's F = 100 x 200, right?

Say I want to move something at the same speed, but its mass is only 10 g. Would that be F = 0.10 x 200?

Does this formula only work if it's arranged with Newtons, kilograms and meters? Or could I multiply pounds and feet, then use a simple conversion to change the answer to Newtons?

And one Newton is the force it requires to move a kilogram one meter in one second, right? Have I grasped this right?