1) The shop shouldn't charge you more than one hour's work to remove the old muffler and install the Magnaflow (most shops round-up to the nearest hour, but the job will only take them about 30min).
2) The "wood-looking" stuff you mean is just dash/door trim. It's called "bezel" where it surrounds the controls on the front console.
3) As far as online sources, try
https://www.rockauto.com/applet3.html . Other than that, you'll have to shop around (you can try scrap yards, but matching the trim colour can be tricky).
Good luck
__________________

1990 5spd V6 Camry (Still kicking at 393,000km) 1991 Celica GTS -- Pappa needs a 3SGTE...and AWD for all this friggin' snow
Honda my A$$, you just can't kill a Yota...