Mr. Printables is a site that has an English alphabet poster with colorful, corresponding pictures to match the letter, and Student Handouts is a site that has free printable English alphabet handwriting worksheets. Alphabet posters are perfect in primary classrooms for students to practice letter recognition and for help in handwriting.
Children can begin learning how to recognize letters as young as two, but there is no rush in teaching the alphabet. Children who do not express an interest in learning the alphabet as a toddler will not be delayed in reading. Providing an environment of words and letters is more important than flashcard drills and practice sheets, so include lots of alphabet posters and books for early learners.