You're missing a lot of info on what your garage is like now, the width, length, how much storage area you need to be overhead, what you plan to store, & whether you have, or plan to have a lift. Other things that will help is to explain what you have currently for wall & celing treatment, like if you have drywall, a suspended ceiling, or if these areas are exposed.
A simple idea is to just get rafter hung shelving if your ceiling is unfinished, or put up a large shelf across the back wall that you can drive or walk under if the building isn't too wide.