Here is a list of the very basic exercise equipment that you would need when starting out a home gym. These are some of the least expensive items that I have found.
Pulling Harness $100
Flooring: Price depends on size and thickness of the mat. It is suggested that a 3/8 or 1/2 inch mat be used if using heavy weights.
Lifting Platform $200
Stone Molds $245
Bumper Plates $529-$982
Squat Racks $120-$850
Some of these prices like the keg as well as the lifting platform are estimates. Also, you have the choice between either a weightlifting cage, or a rack so this has the less expensive rack. The total does not include tax, flooring, or shipping and handling
This is a very basic list of the general pieces of equipment that you need when starting your own home gym. I hope this has helped you in finding the best equipment to design your gym.