Once your child knows individual letters and can distinguish simple phonics in simple words, it may be a good time to try reading the first words. However, the pace here is clearly set by the child. Don't force a preschool child to do these activities, if he or she doesn't want to, can't do it, or just isn't interested. Try to awaken an interest in reading in him or her first, and then the child will be more motivated to experiment with reading. Be sure to read a lot together to make it clear that there are interesting information and stories hidden in books. Do not start reading using regular books but start reading easy and simple words and text instead. You can also try match words to pictures exercises. It is also very important to commend your child for every success, but also failure, while reading. The effort counts as well!