Yes, you will need a heater. You want to keep the temperature stable and at 70-80°F. You would be better off with a filter, a sponge filter or one of these should work: http://www.drsfostersmith.com/produc...1&N=2004+22769
Use at least 10W of lighting, try the mogul base (normal screw in) compact flourescent bulb that they have at Walmart. Do not put the tank next to a window, it will be more prone to temperature fluctuations and algae outbreaks. You probably can get away without CO2 addition, but you might want to use Seachem's Flourish Excel after a while. Get the biggest tank possible, fully cycle the tank, and use the search function of this site and continue to ask questions.