It may not possible to do what you want with the D7000 and a wireless remote. The D7000 User Manual is inconclusive on this point. Page 73 indicates you can take exposures up to 30 minutes with the remote, but page 81 seems to say that when in Remote release mode the shutter will close after thirty seconds or when you press the button again, whichever occurs first.
My preferred method for making exposures longer than 30 seconds without touching the camera (any camera with the needed connector) is to use a wired remote. There are also a plethora of non-Nikon branded wired remote cables that fit the D7000. I recommend getting one that includes a built in intervalometer. I own a similar model that works well with my Canon cameras.
With a wired remote you can operate the shutter from behind the camera and also have the ability to do a half press before releasing the shutter. You can use the viewfinder or the LCD screen in Live View to be sure of the framing and focus. Most wired remotes have a lock that holds the button down for Bulb exposures without having to physically hold it with your finger.