I'm not a seller these days so i can't tell you exactly what you need to know. In your position though, I'd be inclined to contact ebay help till I got past the bot and could speak with a real person for guidance.

The sale of property or time share may come under a different category to regular items.

It may be a category where you pay a set fee to ebay in advance (I don't know if this is the case, but just wondering, as one ad I saw gave an address, which sellers normally cannot do)

Just as an aside, I would have thought $35 sounds suspiciously cheap for timeshare, I would expect it to be in the hundreds at least. If I saw an ad for $35, I'd be backing away wondering what the catch was.

You may be able to list on the actual site of the timeshare, wherever it is. 

See if you can look at the other timeshare ads on ebay if you really want to list here. Note how some ads give details such as annual fees and so on. If I were a customer, the more details the better.