I tried to find a link online but was unable to. So here is a picture. I got it about 14 years ago when I went to the local Judaica store and asked them for a reader. I personally think any reader will do. It just has to run through the letters, the nekudos, combine them, and then combine letters with other letters into words and poof! your child can read. A siddur would work, too, except that kids generally it broken down like this. If your child was older (say 11) and learning because s/he wants to, I would think a siddur would be fine right after mastery of letter sounds and nekuda sounds.