import my old lightroom from another mac to my new one.

Hello Everyone, I recently bought the new Macbook Air and I would like to keep working with the same catalog that I used to work in my previous computer. The problem, I haven´t syncronize the whole time machine, icloud, files, in this new Mac... so I just want to get the catalog from Lightroom into this new computer and continue my work in lightroom... 
What do I need to do in my old computer to back up the work done and then import that into the new one. Please step by step. thanks. 

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