If you are planning on using proper words to perhaps form sentences, a list could be of benefit. (Like Chris has done)Methods for forming monosyllable sounds:
*If the letter-pair consists of 2 consonants, place a vowel in-between as a filler. (Example: TN = tin)
*If the letter-pair consists of at least 1 vowel, say the letter pair how it would sound as if it was a word. (Example: BU = Boo, AE = "Eh")
*Have a pre-memorised list of audio pairs, similar to a letter-pair image list.
F and O are the targets in "Foe", because when you say "Foe" you only hear the 'F' and the 'O'.
R and D are the targets in "Rod", because they are the consonants at the front and back.
G and E are the targets in "Gee", because they are the only letters you can hear.
L and R are the targets in "Ler", because they are the consonants at the front and back.
This probably is confusing, but after you've put this system to practice it'll come clear.