Even though it's common practice for NYers to load up their fire escapes as though they're balconies, it's a safety hazard and a violation of building code. If there were a fire in the building and people actually tried to use the fire escape, planters would block the path of egress. I use fire escapes to survey building facades for my job, and at times I was completely unable to pass some of the landings because they were so packed with planters. Please keep this in mind when planting on your fire escape; it should not be used as your personal balcony.

Nicci, I'm new to gardening myself but have been pretty successful with herbs the past two summers. For me, the easiest have been flat-leaf parsley and mint (which needs its own pot). Cilantro has also been good. I've had a harder time with dill and basil. You might start by buying herb plants at the farmers market and transplanting them rather than starting from seeds the first year. (or not!). Good luck!

Even before I saw that first comment, I was going to say it is illegal to have stuff on your fire escape, so in case you get an objection from a landlord, coop or condo board, or the building gets a violation, put your plants in separate, easily moveable pots, rather than in large heavy trays, window boxes or flats, so that if you have to move them inside, you'll be able to do so easily, and all your work will not be lost. Chances are you'll be fine....

As to plants, the direction of the sun, and amount of light you get, matters. Brooklyn Botanic Gardens used to have people who'd give advice on what you can grow...I'd try to call and see if they still do.

I planted a vegetable and herb garden in milk crates on the roof of my first Brooklyn apartment years ago, and despite copious watering, the plants burned out due to unrelenting sun, with no shade. Too much sun can be a problem...you might even need to shade them part of the day.