Start by writing a simple sketch that reads your thermistor and prints the output to the Serial console.
Basically what you to do is take an analog reading of the pin it's connected to, then calculate the temperature using the beta-coefficient formula. (so NTC between GND and analog pin, and a 10k pull-up between the pin and Vcc).
reading = analogRead(pin);
temperature = 1.0 / (log (NTCSERIESRESISTOR / ((1024 / reading- 1) * THERMISTORNOMINAL)) / BCOEFFICIENT + 1.0 / (TEMPERATURENOMINAL + 273.15)) - 273.15;
Fill in the values for your thermistor (nominal value 10k, series resistor 10k (measure this for better accuracy or use a 1% or better resistor), bcoefficient see data sheet, nominal temperature normally 25°C).