Setting up a dreamboxx

Hi folks

I'm new on here! Just wanted to know if someone can give me info on these dream boxes. I had one installed for over 2 years by paying someone. I would love to try it myself. It is hard? Do they get the subscription from the cline company's or do you need a sky card. Some stupid noob questions! I read over the thread how to set it up. Just wanted to know. Thanks guys!