Filtration for a well
It depends on what you want to filter out of the water as to what type of filter you install. It sounds as if your biggest issue is the sulfur smell. If it is the typical rotten egg smell that many folks complain about, you should know that there are several different causes for that. The first is the anode rod in the water heater. Often times because of the chemical nature of some well water, the anode rod will produce this odor. Obviously, you will notice this in the hot water most of the time. The second cause of the rotten egg smell is bacteria build up in the well itself. Disinfecting and flushing the well with bleach can take care of the problem in most cases. The third possibility is that the sulfur smell can be leaching from the formation the groundwater is drawn from. In this case, the filter mentioned or something similar may be a good option.