Think the Good Life or if you are really serious then Homesteading. Self sufficiency is the art of not requiring anything other than which you can provide yourself.
To be truly self sufficient there are a couple of things you should bear in mind as these might help you. You will probably need energy of a kind so you should look to renewable energy sources to ensure that your home (which you will have built yourself of course) is what is known as an autonomous building, i.e. one that does not need be connected to the mains water, or national grid. You will also need to produce your own food and so you will need to be a master in the garden also -- producing food indefinitely without harming yourself or harming your local environment or ecosystem.
