You've probably already found one or two benchmarks while doing something else. Now you want to go on your first benchmark hunting trip. Pick about 10 ["PID"]s to look for, preferably fairly close to each other. If you can, pick some that other people have found within the last year or so.

Print out every page of PIDs' ["datasheet"]s. Even if you intend to 'go paperless' with your benchmark hunting, it is good for your first trip to use paper. On each paper, use a highlighter or other marking method to highlight these things:

These are the most important items in a datasheet. When you first visit the location of each PID, review these highlighted items.