First you want to decide what your budget is and how much you want to spend. You will want to look for one that is easy to use, especially if you are a beginner. You will also want to decide what ingredients you will want to juice and which machine will do that the best. Check how much juice it will yield and whether it is a pulp-ejection or non-pulp ejection. Pulp ejection juicers gather pulp into a separate basket or container to allow continuous juicing, which is more efficient for making large quantities of juice. Non-pulp ejecting machines collect pulp inside a basket or container which must be cleaned when full - after juicing about one quart. Sometimes paper or plastic filters can be used for ease of cleaning. Then look at the type. Twin Press and Single Auger juicers-juice leafy greens, wheat grass and sprouts and are the most efficient of juicers.