If you've decided that today is the day that you're going to become the ultimate green thumb, a word to the wise, be prepared to put in some work, money, and time.  Building your own greenhouses can be as simple or as complex as you desire.  The one thing to keep in mind is that no matter what your greenhouse visions are, you need to know what kinds of materials or, greenhouse supplies you'll need in order to make them come to fruition.

In order to begin any sort of construction, you'll need to know what kind of greenhouse you wish to build for the particular plants you intend to grow.  Naturally, if you're going for year-round plants, you'll not only need to think about overall construction, but also mobility.  For instance, common greenhouse supplies include an easily manipulated media (such as wood, polyethylene, or aluminum), a good cordless drill and appropriate screws (or in the case of PVC piping, T-shaped connectors and cross-sections), and a glazing material to cover it with.  

Obviously what you plan to grow will determine exactly what greenhouse construction is perfect for you.  If you're not quite sure what supplies you'll need (and don't want to do the work to find out) you're better off leaving it to professionals and using a greenhouse kit.

One thing you can't disregard is the greenhouse nursery supplies you'll be using.  You'll need to look into pots, fixtures, eco-friendly pest control, and ventilation.  You'll possibly need to take a look at a sort of temperature control aside from a simple ventilation system, especially if you're in the market for tropical plant life.  Also consider what kind of watering system you'll need to keep your plants hydrated throughout the day.

As watering is as important as soil type, there are different types of supplies that could be perfect for your greenhouse.  If your intent is to build a traditional glasshouse, you'll need to think about investing in some hydroponic supplies.  The most popular hydroponics are passive, ebb and flow, Nutrient Film Technique (NFT), and Aeroponics.  The system you're probably most familiar with is the Aeroponic --in which a fine mist or spray is periodically rained on your plants, as in the vegetable isle at the grocer's.  

The simplest form of hydroponic gardening, passive hydroponics requires that your plants sit directly in the special nutrient solution.  The solution is oxygenated to keep the roots from rotting. Ebb and flow is just as it seems:  a pump is plugged into a timer and initiates a watering cycle for a few minutes three or four times a day.  Once the cycle finishes, the water drains into a reservoir, putting oxygen into the root system.  NFT allows a continuous stream of water to reach your plants.

Remember, whatever greenhouse supplies  you use, always consider your plants.  You'll want to be sure no matter what you use that it's 1) eco-friendly, 2) particular to your plants, and 3) allows for the best possible environment for your plant life to thrive.