I have my sub-panel for my workshop all set up, plugs & lites all wired in. The workshop isn't attached to the house & I was wondering what the best way was to connect from the main panel in the house to the sub-panel in the workshop?

Where in the house is the main panel located? Do you plan to go underground or overhead. And one more question do you have a space available in the main panel for a new 240 volt breaker.