Why don't you contact the school she's going to, explain that she's showing an interest in letter-sound correspondences and ask if you could have a list of the phase 1 and 2 sounds that she'll be doing. That way, what you teach will 'join up' with what she goes on to do.
Otherwise, I found the ORT 'read at home' books good. Also 'Floppy's Phonics'.
Alternatively, focus on consonant sounds with fairly regular letter correspondences e.g. s,t,p,n and introduce the short vowel sounds, and make your own CVC flashcards, e.g. hen, cat with a very limited number of phonemes/letters. Use these to make up games, e.g. if you can sound it out, you get to keep it.
Make sheets with simple CVC words such as cat, dog etc. and draw 4 cartoons and ask her to link the cartoon with the word.
Check out the alphablocks game on the cbeebies website - although she would need help and some are quite complicated - it might give you some ideas and confidence.
At the end of the day, she will go at her own pace - playing eye spy, asking her to identify the 'F' on a car number plate, asking which two letters are written the same on a street sign etc., will all help her become aware of the subtle differences between letter shapes, and help her spot patterns, as well as reinforcing the important message that we live in a very literate society.
They will teach phonics at school, and there is always an element of whole word learning for most children, as the 'sight words' are not sounded out in the same word, but learn, as suggested, by word shape. You can buy old-style Peter & Jane books, which are dull, but which introduce the first 100 sight words too. If you read them, you could always ask her to point to a word beginning with 'h' etc.
Finally, don't underestimate the importance of reading to your child for pleasure. If you can inculcate a love of literature in the early years, you give your child the motivation to explore and own books of her own in the years to come. By reading more complex narratives than those you will find in the 'phonics' books, e.g. 'Fantastic Mr Fox', you will encourage her to think about how characters are developed, how books are divided into chapters, the structures of stories, as well as developing a much wider vocabulary and knowledge of the world which will help her become a more successful reader once she gets past the synthetic phonics stage.
Good luck!