I have been a die hard clothesline fan since I purchased a kit from Martha Stewart and set up a proper line. Sure you can use a couple of hooks and a plastic line from Home Depot in a pinch but if you intend on committing to forgoing the dryer whenever possible you really need to respect the line, especially if you want to enjoy the process.
The first thing to think about is how you do laundry now. Do you like to do a load a day or do you save it all up for one day a week, put your head down and plow through? The answer to this question will determine how much space should be dedicated to your line. I have some Amish friends who have a 300 foot line from the back door to the top of their barn. My line is about 75 ft and with my Ecosmart washer that does me just fine. I have a Fisher & Paykel Ecosmart and with its 1000 rpm spin cycle I can get 5 loads done and folded in an afternoon.
Here is what you need for a great line.
1. Clothes line, I like cotton it runs through the pulley system easily
2. Line tightener - keeps the line good and tight - you tie one end and feed the other through
3. Spacers - to keep the clothes off the ground by pulling the lines together
4. Clothes pins - I like wooden but many like the plastic because they come in pretty colors
5. 2 pulleys - Rust proof is a must
I like to put one end of my line near my back door and the other I will put way up in the air somewhere like a tree or a tall post. The higher the clothes the more wind you can catch and the quicker they dry.
There is truly nothing like clothes fresh off the line for a sense of well being. Guests at our farm ALWAYS get bedding fresh off the line if the weather is co-operating and fresh linens off the line are a gift to my children of wonderful memories they will always cherish.