According to wikipedia here are some of the duties for a CNA;

* Answer patients' call signals.
* Turn and reposition bedridden patients, alone or with assistance, to prevent bedsores.
* Observe patients' conditions, measuring and recording food and liquid intake and output and vital signs, and report changes to professional staff.
* Provide patients with help walking, exercising, and moving in and out of bed.
* Provide patient care by applying dressings and supervising exercise routines.
* Prepare patients for surgery, treatment, or examination.
* Transport patients to treatment units, using a wheelchair or stretcher.
* Clean rooms and change linens.
* A nurse assistant must also have a strong grasp of emergency procedures and be able to stay calm in stressful situations.

As the nation ages, more CNA's will be required to work in this field. Check out this site for CNA jobs when you are ready to work as a CNA.