Find a real estate agent.  Make sure you are dealing with a licensed agent or broker.  You will need to research the local governing agencies where your timeshare is located to find out what licenses are available.  There are many scammers out there, so it is important to make sure you are dealing with a legitimate agent.  Agents can help you market your timeshare to a wider market than you may be able to do on your own.

Do not pay upfront fees.  This is a major red flag for a scammer. If you pay a broker a flat free upfront to sell your timeshare, then you have thrown your money away.  First of all, the broker or agent has no incentive to get you the most money for your timeshare.  Additionally, they could run with your money and not do anything at all for you.

Consider selling your timeshare by owner.  Obviously this would require much more work than using a real estate agent, but it could save you a ton of money in fees and commissions.

Use an appraisal service.  Hire a respected timeshare appraisal company to come and tell you what your property is worth.  This will give you leverage when negotiating a deal.

Price your unit correctly.  If you try and sell your unit for what you paid for it you is going to sit on it forever, especially if you bought your unit from a large company.  These companies will spend enormous amounts of money marketing their timeshares and then pass the cost down to you.  This may help you get an inexpensive vacation.  However, you will be upside down in value.

Advertise your sale.  There are special venues for advertising timeshares for sale and it is important to invest in this.   It is not like people who are shopping for timeshares are going to actually go down to the place they are considering.  They are going to purchase the timeshare from home, and then go on their vacation.  So if you are selling your timeshare by owner make sure you invest in good timeshare advertisements.