you can start by introducing him/her the concepts of coloring writing and showing him/her the letters in the alphabet and the numbers. and make sure that you have a schedule for everything that you do and allow time between switching let say from the indoors activity to the outdoors. make sure not to put to much pressure if you do this will not let your child learn it will only get your child frustrated.
Children's play is actually their work. You may want to contact the kindergarden that your child may attend to see what is expected on the first day. Then intoduce these concepts into fun activities at home. Sit down time is important but for very short periods. Some suggestions for practicing writing letters in his name: bathtub crayons, finger paints, drawing with a stick in the dirt. There are many fun activities for teaching letters and developing hand skills in play in the book Alphabet Soup: Stirring Your Child's Interest in Letters (www.lynaot.com) and at Handwriting Without Tears website as well as here at this website.