You really just need to go through your garage and get rid of some crap. I had to do the same to get my workshop to fin in my garage.
I have found the best thing for organizing my shop is shelving (I got shallow ones from Ikea for all my drills and small stuff and deep ones, from Bunnings (Home Depot also have them), for all my big tools. I use a mobile trolley/cart thing like mechanics use for all my hand tools. But I have found that if I am going to a job, customized storage (like Festool Systaniers or Bosch L-Boxxes) for all my power tools and tool bags for all my hand tools are better if you are transporting tools everywhere. But if you keep them in the shop having that at your quick disposal is a hell of a lot easier than having to open a box just to get a drill that you will use for five seconds.