Shop Layout
How you layout your shop space is largely indicative of what your space actually is so these are more just rules of thumb.
Wheel Storage
If you have overhead space -- use it! Hang wheels and tires from the ceiling using bicycle hooks. Use a pole to get them down if necessary.
Purchasing vs. Building
From an organizational standpoint, purchasing used racks, shelving, benches and the like is better in the long term. While building those things can be beneficial in the short term because it is immediate and can cost less initially. In the event you expand and need to upgrade, the thing you bought a long time ago is an asset you can now sell. If you built it the likelyhood that someone will want to buy some old 2x4s or customer welding is unlikely.