In this hobby, especially mini-centric d20, it pays to know miniatures. It's a lot of fun to collect minis and learn how to paint and convert them.
In 3e there are so many possible class/race/equipment combos, most minis will never precisely match your conception of your character. It's handy to have the ability to use file, pins, x-acto, epoxy putty and superglue to transform that off-the-shelf Reaper Dwarf Warrior into a spectacular Dwarf Sorceror/Monk with a shaved head, a cloak of displacement and dual magic gauntlets.
I can recommend a ton of websites with tutorials if you are interested.