Hi Baljeet,
I think that you would benefit from the services of an Authorized Disney Vacation planner such as Dreams Unlimited at www.dreamsunlimitedtravel.com. They would be able to help you find the best discounts for your vacation, depending on the time of year that you plan to travel. Yes, I've used them too!
Without knowing specifically when you plan to vacation at Walt Disney World, I'm unable to recommend specific discounts. However, I can share with you how I look for discounts for my own family's trips.
First, visit www.mousesavers.com. That site is a wealth of information for planning a budget-friendly Disney vacation.
Next, watch the
Special Offers section of Disney's site.
In order to visit the four major parks (Magic Kingdom, Animal Kingdom, Disney's Hollywood Studios, and Epcot) plus the minor parks such as Blizzard Beach and/or Typhoon Lagoon water park, you'll need a Magic Your Way Ticket with the Water Parks Fun and More option.
I'm so excited to hear about your first Disney Vacation and we're here to help you plan a memorable experience. Feel free to return with all of your questions.