Love this set of Hebrew Letter Flash Cards we got at our local Amazing Savings Store.
You can find a similar item on Amazon.
They are big and come with an easy to turn wheel with Hebrew vowels under each letter.
Note: This set doesn't have the phonetic transliterations on the back of the cards. Made more for a Hebrew speaking teacher to help a child or adult to learn Hebrew.
It seems to make sense to teach the letters with the vowel at the same time. This way the child is already "reading" Hebrew just by joining for example the /b/ sound from the Bet with the /ee/ sound from the chereek underneath it.
The truth is we have not been that systematic with our teaching of Hebrew sounds and would love to hear from others about the order they use to teach Hebrew reading and writing.