Will I lose weight on this diet plan? ?

In the short term, yes, you will weigh less - you're planning to eat far less than your body needs (or is healthy).  It isn't sustainable for any real amount of time, and when you go back to eating healthy, you'll gain back fat.

That weight will be some fat, but also some muscle mass.  One protective mechanism of the body during times of scarce resources is to reduce its energy needs, and muscle mass burns calories, so it will allow any muscle you're not using to atrophy.

When your health forces you to go back to eating a proper diet, one with enough energy, you will no longer have the lost muscle mass.  So the number of calories that used to be correct for maintenance is then a surplus, which gets stored.

Yes, but if you keep it up for long, you will likely also be messing up your metabolism with such a small calorie intake. It's not a good way to lose weight.