My Mum started me with the Ladybird series of books (Combined with the various visual aids/posters etc) when I was two.
This was the early 60's however, but it worked for me and there is no reason why a similar strategy shouldn't work for you.
I had read the Hobbit by the time I was four (And a lot more besides. As far as my unfortunate primary school teachers were concerned I was a horrible child! After all what would some poor female primary school teacher in the late 60's know about answering questions asked by a 6/7 year old about Nuclear Fission anyway!

)
Unfortunately, while I learned to read, I never really learned "Literacy" I cannot really write and my reading isn't actually as good as I might have implied. I tend to skim read. IE i can cover a lot of ground quickly but I miss stuff and I cannot read out loud unprepared (I have to read through it first)
It is possible that early reading, unless carefully managed, might actually be a mixed blessing.