PREVIOUSLY POSTED IN GENERAL TECH HELP

I am a new 4Runner owner (2000 SR-5, 5spd, 4x4), but previously had a great experience with a '98 Tacoma SR-5. Where can I find average lifespans for key parts? ie, starter, belts, clutch, plugs, etc. I do most of the scheduled maintenance myself, but I want to make sure I'm pre-emptive with things before they break at an inopportune time.

Any help would be appreciated. Thanks!