Aloha Oleary25,
When just starting, or having physical issues you'll want to spend 75% of your tie doing the active exercises, sprinkling in a meditation to cover the other 25%. So if you have set aside 30 minutes each day for qigong, your routine could look something like doing 2 or 3 active exercises for two days, followed my a sitting meditation on day three, and then repeat.
If you want to commit to two hours, a suggestion would be going through the active exercise set (CD #5 = about 50 minutes), skipping the Harvesting of Qi, and go right into one of the sitting meditation (my pick would be the hour-long CD included in the Dleuxe/Level Two course). The active exercises help prepare you to go deeper in your meditation.
Does Chunyi have some suggestions and specfics he's found helpful for working with cancer, etc? Yes. And know that you have a very powerful tool in the Small Universe meditation and great training in the Self Concentration exercise - both found in Level One.
Much Love, Shawn