Ignoring the Priapism4tooLong/Arkangeloid circle jerk above and adding one last post on this thread before I'm out:
No one gives a **** on the wards if aminoglycosides bind the 23S subunit, the 50S subunit, or the 291034823905798034275S subunit. Not even ID. The OP is a graduating M4 about to start residency, not an M2 about to take Step 1. The spreadsheet given above is useless and spending time memorizing it expecting it to help you on the wards would be an utter waste of your effort. What you actually need to know is the basics of coverage (does it cover gram +? gram -? anaerobes? pseudomonas? MRSA?), the routes of administration, and some information on whether they penetrate lungs/urinary tract/soft tissue. Combine that with a basic understanding of what organisms cause what kind of infections and you can reason out why we pick the empiric treatments we do. That reasoning sharpens over the course of your clinical time, especially once intern year starts. Duration of treatment is really more of a crapshoot depending on the infection, and is usually a pretty arbitrary expert opinion that you will memorize over time.
That said, having a resource that lists the empiric treatments is useful for day to day activities, which is why I recommended something like the EMRA guide.