Deli meats contain nitrates and, sometimes fillers like flour or milk powder. For some folks the nitrates (and salt) in deli meats slow weightloss.
Most cheese is OK but does have some carbs. Dr. A. (may he RIP) said to limit cheese to 3 ounces a day.
You can register with www.fitday.com
to check out carb counts of different cheeses and deli meats.
Keep it simple at first and you will lose weight faster. By that I mean, real food, not shakes and bars.