First-Then cards are one of the most simplistic visual cues for those with Autism. They are simple as well as effective.
This type of visual intervention presents to the student what need to be done FIRST, which is THEN followed by the reinforcement.
(I usually laminate each sheet so that I can write what the student needs to do first, and what the student will get after the task is completed, with a white board marker. For lower functioning students, I usually laminate each sheet as well as pictures of the tasks and pictures of the reinforcements, then place a Velcro dot on the back of each picture, task, and reinforcement word, and the joining Velcro on the "First" and Then" line. This will give them additional visual supports as to what needs to be done and what they will get in return.)