In terms of simplicity for yourself, the simplest approach is to shoot just RAW, then go through the images using Lightroom/Bridge/Canon's Digital Photo Professional/etc. and edit the ones you consider editing worthy and leave the ones you think are fine.
Then just batch convert all image - which you can then stick in a dedicated folder (say called JPEG) which can be in the image folder with the RAWs.
Obviously if you want to give images to your clients immediately, this won't work, however the benefit of the above approach is that it is more streamlined than fiddling around with in camera JPEG and RAW and then sort through both. (There was a time when I was shooting both and when I tidied up, I binned the JPEGs because they are useless - using dedicated software will give you a higher quality JPEG than using the camera.)
The other advantage of doing the JPEG conversion later is that you can decide how big or small the JPEGs should be - i.e. you can say limit the width to 1000 pixels and give those out as previews.
Having said all of that, it is really the photographers job to sort through the images and edit them. It is quite likely that many people will be disappointed if they see the RAW output from an SLR and will only really appreciate the image after it has been edited. SLRs do not sharpen and saturate images as much as compact cameras do - but people got used to the look of such photos.