Trying searching for "timeshare scam" on the internet and see how many millions of results come up.
There's a lot of articles that outline classic scams, etc, if you go looking for them. This is a good link, a top ten:
10 Secrets Time Share Resorts Won't Tell You
Found it on this website, which has been showing up a lot in my google results (I thought about becoming a timeshare agent for awhile but decided against it in the end):
Timeshare Consumer Group