If you have chosen to outsource, all if this does not apply to you.
Do you want to host the application yourself?
On https://www.dnnsoftware.com/wiki/how-to-install-dotnetnuke you can read how this should be done.
Do you wish to select a hosting company other than Tjep's?
There are companies with very low prices like SmarterASP but also companies that offer more quality and service like Managed.com, DNN4less en WehostDNN. Quality of course mans higher fees but if you do not have your own IT department, this comes highly recommended.
Do you want to experiment on your own laptop? On www.nvquicksite.com there is a tool which enables installing DNN in minutes on your local machine..