Whether you live alone or have a large family, creating a healthy environment is an important step to well being and living a longer, happier life. Making a healthy home does not mean you need to change your whole lifestyle but starting with a few small steps can lead to bigger ones in the long run.
The Center for Disease Control provides a comprehensive list on their website of things you can do around the house to make it a healthier place for everyone. It gives you tips by each individual room such as things you can do in the kitchen, garage etc. http://www.cdc.gov/healthyhomes/byroom/index.html
Better Homes and Gardens offers over 20 suggestions to create a healthy home including using low VOC paint and replacing carpet with easy to care for wood. They also suggest saving electricity and water through changing not only fixtures but also the way in which you use them. You can read all of their helpful ideas at http://www.bhg.com/home-improvement/advice/expert-advice/25-tips-for-a-healthier-home/
Some easy first steps include adding more energy efficient products to your household, using natural cleaners, drying your clothes on the clothesline, and installing a whole home water purification system.