Playing with crayons, or some other fun color something that will make sparkling, delightful marks on paper is a good warm up exercise.
Now study an item of interest. Draw it with your eyes first. Compare the negative shapes (the area that is not the object) to the positive shapes (the object.) Get into a comfortable position. Make sure your legs are comfortable. After you have studied the object, draw while you smile and breath deeply, relaxing your shoulders.
Draw a series
Get to know your subject matter.
Practice drawing the same thing from different angles or draw another of the same kind of thing, such as 4 different banana peelings.