I would recommend starting on your days off. You have much to learn about the master cleanse, and it is just easier if you could be at home those days...IMO...
For your first flush, I would recommend following the program of using both the laxative tea and the salt water flush.
I am not sure which tinctures you are using, but everyone needs to modify the program to suit their needs. Doing the Cleanse as close to the book helps, but we are all individuals. My opinion is that if you have been on it for a short time you could continue using it, if you have been on it long term, you should probably give it up and allow your body to detoxify from it...
Also there is an on-line version of the book. It is rife with mis-spellings, etc...probably scanned and OCR'd or typed in...I would read that before beginning...it is only 30 some pages...