Have a look at the sticky posted by LannyPC. Lots of good info.
Step 1 - determine if you want to sell or give away. Setting your selling price is the hardest step. You likely have many years and dollars invested and you want to recoup. Unfortunately timeshares aren't real estate. Resorts are selling a dream, an ideal vacation lifestyle. Here on TUG we've all been through the process so we understand the reality. Follow the advise in the sticky. Research. Research. Research. You will then have an idea or window of the value of your timeshare. A very quick search (with no details on your unit) showed prices from $400 to $21500. And that is what I mean by a price window.
Step 2 - determine who pays for what. Are the maintenance fees paid up and if not who pays? Are there resort, exchange, or other administrative transfer fees and who pays for these? The new deed and transfer documents need to be prepped and filed; who does this and again who pays?
Step 3 - put together an add detailing as much information as possible. You want the prospective buyer to go in understanding everything and who's responsible for what. Rememvber, you're selling a vacation dream so your add should reflect this. Pictures speak a 1000 words.
Step 4 - you have an offer! Now what? Get a signed contract to purchase in place and move on from there. There are many transfer companies that will guide you through the process. We used LT Transfers and were very pleased. The helped us cradle-to-grave and made the whole process painless.
One final note on selling price. I started this journey doing step one but maybe didn't do enough research (found TUG later in the process). The value of our timeshare ranged anywhere from free to 1,000s (and in some cases into the $10,000+ range). I know after sitting through an owner "meeting" (OK a 2 hour sales pitch but got our free Cirque did Soleil tickets) that the retail price was between $19,000 and $25,000 depending on when you gave in

. We had paid pennies on the dollar by buying off of eBay in 2011 and being Canadian had no mortgage/loan against it. Giving it away and paying the ~$500 transfer fees (buyer paid exchange fees and 2020 maintanence fee) in the end made most senese. We tried the"market value" of about $3500 through a reseller a year ago but that was just a waste of time and $495. Daily Management wanted $2500 to deed back the timeshare. In the end only you can determine what the unit is valued at, what your are willing to pay to let it go, and how long you want to hold on to it.
Good luck and don't hesitate to ask queations. There's always someone here that will help.