Generally, all marketing expenses will come out of your own pocket.
Advertising such as signs, brochures, ads, postcards, Internet marketing, professional photos (if you don't have a decent camera), staging (if the listing warrants it), open house supplies, lockbox for the door, etc.
You'll have to pay most of the marketing expenses up front. If the property doesn't sell, you will have to write off the expenses and move on to your next listing, so be very careful not to "buy" an overpriced listing in your eagerness to get your first listing.
You may have better luck as a new agent by offering to hold open houses on listings of other agents in your office. It's a good way to meet potential buyers, which may be a better focus right now as a new agent. Buyers require less out of pocket expenses.
Does your broker offer any type of mentoring classes? If not, you might consider taking the 3 part GRI course as a means of picking up good, practical info on how to actually BE an agent vs what you had to learn to pass the state test.
Good luck with your career.