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Also not an accountant or lawyer, but I think that if you're paying someone by the hour, and directing them as to how they should do they job, they need to be classified as an employee, not a contractor. This means a W2 instead of a 1099, plus you need to pay them on a fixed schedule, pay social security and medicare taxes (and likely other taxes depending on jurisdiction) on their wages, deduct income taxes, do an I…
We had some employees in NYC earlier this year. They make California employment laws look simple in comparison. Definitely, Definitely get a service there that knows how to handle all of the fine details.
NY posts all of the requirements for hiring a new employee on a single page. It's a simple process, and even simpler if you use a payroll service provider.