Hello! I do not play Cello, I play Saxophone. Ledger Lines can be tough, but I recommend either buying a note-fingering chart of search up “Cello notes and Ledger Lines.” Something like that!
The way I learned is, lines are; E G B D F
As well as spaces are; F A C E
These are 8th notes as well so your rhyme will pick up. I do not play cello, but I do hope this helps just a little!