what should you eat prior to first Liver Flush? (and a few other newbie ?'s)

I am about to start my first Liver Cleanse. I am using Dr. Clarks plan from this website. I have been taking Magnesium for a week and want to do the parasite cleanse and kidney cleanse before the actual Liver cleanse. I do not have any life threatening disease but skin problems and various little things that make me feel not my best!
I was wondering if anyone had any feedback on how important it is to do each of these processes. To do a live Flush as suggested by Clark it is at least a 4 week preperation. Does everyone go through all these processes? How long to wait between them, can you do a liver cleanse the day after kidney or should you give your body a rest? and also what you should eat prior to a kidney or liver cleanse. I am a vegetarian and eat mostly organic. Is it best to fast first or build up your energy with good foods? Ok one more question - where are people finding these herbs and supplements? I have a Whole Foods Market (old Bread & Circus) nearby that has natural health stuff, but it is kind of expensive. Any suggestions would be greatly appreciated by this newbie!! It seems this is the begining of a long process to better health! I am a bit impatient though! Thank you!! Peace!