Start at top or bottom of the list, it isn't that important... the import thing if you're going to import multiple keys at once, is to use the "false" parameter after every
importprivkey command except the last one... like this:
importprivkey "KpriVatEyKeyNumBer1" "" false
importprivkey "KpriVatEyKeyNumBer2" "" false
importprivkey "LpriVatEyKeyNumBer3" "" false
importprivkey "KpriVatEyKeyNumBer4" "" false
...
importprivkey "LtheLastPrivKeyInTheList" ""
Note: format of command is
importprivkey <bitcoinPrivKey> <label> <rescan?>
Adding the false parameter stops Bitcoin Core from automatically rescanning the blockchain for transactions related to the newly imported key... this can take quite a few minutes (if not hours) to complete, so you only want to do it after you've imported the last key... otherwise you'll have the long wait after EVERY importprivkey!