Okay, here is another great news. You actually need to suffice two conditions: darkness and humidity.
That is basically it. Once you have given the mushrooms what they require, they can be productive. You may even have more than one batch. Just think of the nutrition you can get from them with minimal to no effort at all!
For starters, here is what you need to do
Check out the local gardening store. Look for the mushroom kit section. Remember that each species of mushroom have different levels of requirements. Remember, it is best to buy the complete kit. If you cannot find any mushroom kit in your local store, find one online. Many online stores offer different kinds of mushroom kits.For beginners, stick to the oysters, white or button mushrooms . These are the easiest to grow. It is highly recommended that you buy online as the prices tend to be more competitive. You also do not need to worry about the delivery as almost all would gladly deliver your kit at your doorstep. These kits have everything you need, including the spores, or spawns, the substrate as well as other things needed for the mushroom to grow.
Since some kits would provide you with a box or container where you can keep growing the mushrooms , the only thing you really have to be aware of is humidity- and that is, water your batch twice a day to keep the moisture up.