@michi247 - Wala pa yatang nakasagot sa question mo sis. If you will let me, here's my suggestion based on my experience.
Start with individual sound of the letters. Yung ba-be-bi-bo-bu, ay blends na yan ng two phonemes. Before I move on to blending letter sounds, I made sure my daughter knew at least 80% of the letter sounds. Okay lang kung makalimutan nya yung sounds ng x, z, q or yung mga latter part ng alphabet. The child will catch up for sure.
Mas mabilis matuto magbasa ang bata na marunong magdecode ng word based sa sound vs sa whole word approach. You can teach the whole word approach later on when your child has started to blend simple CVC words like cat, mat, sit, bit, etc.
This is just teaching reading in English.
Kung sa Tagalog naman, magagamit mo rin yung knowledge ng bata on phonemes to teach abakada. Kasi yung abakada natin more on letter sounds. If you plan to enroll your child in a private school where English is the medium of instruction, I suggest you start teaching your child to read in English. When she or he is confident in reading simple English words, you can introduce abakada. Madali naman ang transition. You have to adjust nga lang on some sounds, kasi iba yung pronunciation ng vowels natin in Tagalog sa English. But, don't worry on this much. Kahit nalilito ang bata sa English at Tagalog sound at the start, turo lang ng turo. Explain the differences to her once or twice. Don't explain much. The child will learn the nuances between the two languages on her own.
To get you started on letter sound, I suggest you have your little one watch the Youtube video of Barbara Milne's Letter Sound. I prefer the original version than the revised. I think she changed the sound of "r" in the revised, which I think sounds wrong.
The next challenge for you is how to teach your child to blend the sounds to make a word. Maraming bata ang natatagalan sa stage na ito. Kadalasan hindi nila alam na yung dine-decode nila na cccc-aaa-tttt, reads as cat. Before you ask your child to read 'cat' in print, my suggestion is to let him 'hear' the word first. Laro kayo ng 'Guess the Word.' You will say the individual phoneme or sound of simple words, and then let him guess what's the word. Start with shorter interval between letter sound. So instead of cccc-aaaa-tttt, say it like, cc-aa-tt, so that your child can 'hear' the blends better. Matutuwa anak mo sa game na ito. Kahit kumakain kayo pwede nyong gawin ito

Kung magaling na ang anak mo sa game na ito, you can begin teaching reading the words in print.
Reading 3 letter words is a start. Let your child read decodable books in her current level to practice her decoding skills and improve visual discrimination of letters. Moving forward, you can introduce some basic sight words and more advance phonic rules.
You can do this with your child even if you were working full-time. I was working full-time when I was teaching my daughter to decode simple words. I devote just 10 to 15 minutes of my time daily for these activities. Slowly but surely, she learned how to read.
Hope I am of help.