Hello Andie and thank you for your question.
You will need to purchase a cable connector (see step 18), wire nuts (step 20), and plumbers putty (step 10) since these items are not included.
Before starting this project, be sure to avoid a SHOCK HAZARD by turning off the electric power at fuse box or circuit breaker.
Since there is no existing disposer, you will disconnect the sink drain and skip to Step 9 of the installation manual (http://www.homedepot.com/catalog/pd...
Be sure to wear safety glasses or goggles when making the dishwasher connection in steps 15 and 16.
Best wishes on your project!