What are the letter names of all the lines and spaces from line 1line 5 on both clefs?

The lines of the treble clef, from bottom to top: EGBDF. The spaces from bottom to top are FACE.

(FACE is an actual Word, so it's easy to remember; the mnemonic for the lines is Every Good Boy Does Fine.)

The lines of the bass clef, from bottom to top, are GBDFA. The spaces (bottom to top) are ACEG.

(The mnemonic for the lines is Good Boys Do Fine Always; I'm not aware of a mnemonic for the spaces, but it's pretty easy to figure out.)