Connect DAC IC to current sinking controller
For Q1, yes the 2 kohms is a minimum output resistance. Otherwise the DAC won't be able to source enough current and the voltage droops when you start requesting too much current for your load. The output capacitance is more about the response time for your output. If your output capacitance is too high, the RC time constant gets too large and the DAC doesn't perform as quickly as specced. 

For Q2, as MarkU said I doubt the DAC can supply that much current so I'd hook it up to a Op-Amp unity buffer or some amplifier configuration.