This is the new, cloud based LR CC forum. Your question sounds like it is about the Classic, file based version.
The basics are that you have to transfer all the photos and the Lightroom catalog. Without knowing where you keep your photos and the file structure it is hard to be specific.
With the new cloud based Lightroom CC, there is nothing to do besides installing the software. All the photos are on Adobe's servers.
There are good tutorials for this on YouTube and similar.