1.What is my Future, 2.Should I use any Gemstone, 3.When I will go Abroad, 4.Whom should I Worship/My Isht Dev?

Regarding your question about your Isht Dev or whom you should worship. I would like to tell you that it is matter concerning religion and have no relation with astrology. Readings or predictions on such matters based on planets is absolutely wrong. Our religious texts like the Vedas and the Upanisadas condemned it and stated that such faith in planets and stars takes a person to the darkest regions of ignorance. So, if you so wish, you may go to a true Sadhu who will guide you properly in that respect.