Prepare for lots of replies from entities promising to sell your timeshare, or relieve you of those pesky maintenance fees, and promising $XX.XXX if you'll only give them (several thousands)$ upfront. These are ALL scams. Reputable sellers take their commissions from sales proceeds (except reasonable marketing costs).
Check what similar weeks as yours actually sell for on eBay (it won't be much) if you don't have pricing info. Then for the price of TUG membership ($15/yr) you can list it in the TUG Marketplace in the red stripe above here, or offer it free in the Bargain Deals sub-forum in the Buying, Selling Renting Forum.
Hundreds of people relieve themselves of their unwanted timeshares here.