When shooting JPEG, its best to understand the limitations on editing that you can perform. Just because you shoot JPEG does not mean the images are not editable, however the degree of edits you make may be limited. In general, I would shoot at the highest quality JPEG setting your camera offers, to minimize the amount of compression artifacts and preserve as much detail and color accuracy as you can. This should help extend the abilities you have while performing post processing.
Assuming you are saving your JPEG photos with the highest quality setting possible, you may want to consider which settings to configure in-camera. When making minor edits in post processing, such as slight contrast adjustments, you usually will not have to worry. Significant adjustments, such as a very broad shift in white balance, will often result in undesirable or unnatural color divergence (i.e. landscape may look fine, but clouds may end up too blue or yellow.) You might want to choose the best white balance setting in your camera, and get as close to correct as you can, to minimize the amount of white balance correction necessary during post processing. On a similar note, more significant shifts in saturation can often enhance compression artifacts. It may be best to choose a picture mode that produces the amount of saturation you prefer in your photos, which should also help minimize the degree of post-processing edits that must be done.
It should be noted that as long as you don't have to make significant edits in post processing, you should be able to perform almost any kind of post processing on a JPEG without worry. If you use the highest quality JPEG setting, you should have a fair amount of leeway for edits as well, and while you will never be able to make the kinds of radical post-process adjustments and corrections you can with RAW, you might be surprised how much flexibility you still have with a high quality JPEG image.