The 'Leveling' spreadsheet tab on the 'Classic WoW Planning' spreadsheet has an amalgamation of input for a recommended leveling path to cap. The rStart and rStop are the recommended level to start/stop farming a given area and the aStart and aStop are the actual levels I started and stopped for my first team. On my 2nd team I farmed the HyperSpawns to 20 (moved to the crabs at ~17 to 20) and trained up and spent talent points before going into DeadMines and recommend that better than going there at 18:

https://docs.google.com/spreadsheets...it?usp=sharing