Answer : First and foremost It's important to first think about the types of exercises you want to do in your garage gym. If you're mainly interested in strength training, then you'll need a weight rack, bench, and some weights. If you're interested in cardio as well, then you'll need a treadmill or elliptical machine.
Once you have an idea of the equipment you'll need, start by measuring the space in your garage and deciding on the placement of each piece of equipment. You'll also want to make sure there's enough room for you to move around comfortably.
Finally, consider what type of flooring you want in your garage gym. Rubber matting is a good option because it's durable and protects against falls.