Are you pulling out of your regular house breaker panel? If so, All you need is a breaker(single pole) of the same brand breakers that are in your box. Using one pole will give you the 120v you desire. Every wire in your house should go back to this breaker panel. If the panel is full(no extra slot) then you have a little bit of a problem. You DO NOT need to install a second disconnect box if you are pulling from your panel. That would be redundant.
You can get single pole breakers of various amperages.
Since you are running a dedicated line, I would run 10/2 Romex.
If you are having a licensed electrician do the actual work, ask him what you need. Also, you may want to get a high grade outlet such as a Wattsgate or Hubbell for your outlet.
By the way---contrary to popular belief, A lot of electricians buy their stuff at Home Depot and Lowes. Both stores offer a "Commercial" sales department and carry a good supply of materials at a reasonable price.
You can get single pole breakers of various amperages.
Since you are running a dedicated line, I would run 10/2 Romex.
If you are having a licensed electrician do the actual work, ask him what you need. Also, you may want to get a high grade outlet such as a Wattsgate or Hubbell for your outlet.
By the way---contrary to popular belief, A lot of electricians buy their stuff at Home Depot and Lowes. Both stores offer a "Commercial" sales department and carry a good supply of materials at a reasonable price.