Please suggest basic workflow for importing .wav from a (Zoom H4n) SD card.
File > Add to library and select the folder with the files on the SD card.
How about keeping the .wav on the MacBook and converting to an other format at the same time.
iTunes prefs > General.
Click the Import Settings... button and set the format you want the files to be.
Hold Option and File > Create AAC - Convert to AAC (or whatever format you selected above) then select the folder with the files on the SD card.
This will import/convert the files at the same time.
The WAV files will remain untouched on the SD card. They will not be on the computer (the the AAC version will be in iTunes).