As for watering and fertilizing here is what will be needed. When watering make sure the soil is almost completely dry (not completely) before watering. This will be a skill that might take a little while to perfect but can be done by sticking the tip of your finger (about and inch) in the soil near the edge of the pot. when it feels almost completely dry with just a slightest ting of moisture its time to water. A beginners method is to place a chop stick in the soil near the edge of the pot, when it looks dry its time to water. As for fertilizing i recommend using a well balance formula meant for acid loving plants as azaleas need a soil of a low PH to be happy.

Using a liquid fertilizer you should fertilize during the summer once every other week. If this will be your method don't use Miricle-Gro Miracid fertilizer which is most easily found at hardware stores/nurseries as it will burn the roots easily, which will damage and possibly kill the azalea. I recommend using an organic type as it will make burning the roots a lot harder. Organics as refereed to in the name are made of natural chemical components while non-organic types are made from chemical compounds. Slow release organic types are even more preferable if you want a more care free fertilizer as it will only need to be applied then once a month. You can find some good acid granular (slow release) fertilizers on eBay.

As for keeping it long term (for years) Keep in mind that it will most likely need a dormant period to rest during winter. On exception their are some semi-tropical Azaleas, but am almost definite that isn't your case. If you are truly up for the challenge of keeping it alive for years to come it will take As a means for every day care and long term survival I recommend you read some bonsai books (which can be easily be acquired from your local library) on how to properly care or your azalea. I also recommend doing some online search for the specific azalea you have seeing as some have different needs than others.

Good luck

-Mike