Here is a simple resource for working with ABC order at a very basic level progressing from arranging an array of 3 letters, to an array of 4 letters to simple words from the Dolch Sight Word List.
I have included two versions of each level of activity so activity could be used more than once to reinforce skill.
The activity could be modified in multiple ways depending on your student, such as instead of having the students cut out the letters from the provided pages use foam letters or laminate the blank pages and have the students use dry erase markers to fill in their answers. The sky is the limit.
Hope you enjoy.