there probably already is a post on this,
but can someone direct me to place that gives instructions on how to install the spoiler on my tc.

i have the ebay one, pedestal spoiler.

"The eBay one"? You're going to have to be more specific than that. Is it the OEM pedestal spoiler? You can find instructions for that on TRDSparks.com. Just find the spoiler on their site and look in the upper right.

drill holes and mount?

if you want anything more specific, you have to be as well.

vague question = vague answer