I agree with letting yourself by guided by your son.
I am keenly aware that most parents (and quite a few teachers) don't understand what 'phonics' means. This is partly because advocates of SP now use the term not just for teaching basic letter - sound patterns (as the term was previously used) but include alternative pronunciations for graphemes and variant spellings for sounds as well.
I tried to explain the English spelling system on the thread Phonics - basics on this forum. It got severely diluted by the advocates of SP who disapprove of my attempts to provide an objective description of the English spelling system. I'll paste in a few on my posts from it, in the hope that u might find them useful.
Words are made up of sounds which are blended together: cat is a blend of C ? A - T.
Some sounds are spelt with just one letter, as in ?cat?, others with two or three (ch, igh). The different spellings for sounds are collectively known as ?graphemes?.
For reading, children have to learn to sound out the graphemes and to blend them into words.
For writing, they learn to break words up into their constituent sounds and what letters to use for them.
Most European languages have around 40 sounds.
English has 43 ½ sounds . (The ½ sound is the unstressed, barely audible, variously spelt vowel which occurs mainly in endings, such as ?flatten, certain?, but can be elsewhere in a word too (decide, invite, abandon).
The 43 main English sounds (in alphabetical order) are as follows (illustrated with the words in brackets).
a (ant) ai (rain) air (air) ar (arm) au (autumn)
b (bed) ch (chip) d (dog)
e (egg) ee (eel) er (herb)
f (fish) g (garden) h (house) i (ink) -igh (high) j (jug)
k (kite) l (lips) m (man) n (nose) -ng (ring)
o (on) -oe (toe) oi (oil)
oo (food) oo (wood)
or (order) ou (out)
p (pin) r (rug) s (sun) sh (shop) t (tap)
th (this) th (thing)
u (up) -ue (cue) v (van) w (window) y (yak) z (zip)
zh (spelt mostly -si-) (television)
Because some English sounds are spelt differently in different positions of words (may, make) or are spelt differently for other reasons (kick, comic),
the basic English spelling system uses 81 graphemes:
a (ant) ai (rain plate play) air (air) ar (arm) au (sauce saw)
b (bed) ch (chip stitch) d (dog)
e (egg) ee (eel funny) er (herb)
f (fish) g (garden) h (house)
i (ink) igh (by bite) j (jug bridge oblige)
k (c/at/ot/ut crab/ clap kite/kept comic pick seek/ risk quick fix)
l (lips) m (man) n (nose) ng (ring)
o (pot want quarrel) oe (toe bone old) oi (coin toy) oo (food) oo (wood)
or (order wart quarter more) ou (out now)
p (pin) r (rug) s (sun face) sh (shop station musician) t (tap delicate)
th (this) th (thing) u (cup) ue (cue cube) v (van have) w (window) y (yak)
z (zip) -si- (television)
There are also:
8 main endings ( doable, fatal, single, ordinary, flatten, presence, present, other),
2 main prefixes (decide, invite)
and consonant doubling for showing that a vowel is short rather than long (dinner ? diner).