Overwhelmed and looking for advice (cleanse and weight loss)

Hi all. I'd been told about the advantages of cleansing and detoxing, and finally decided to look into it. Then I stumbled across this website. Amazing, and really useful, but SO much information to process. So, after reading a TON of posts and stuff, I figure it might be good to ask for some advice before I leap in.

I definitely know I want to do a colon/bowel cleanse, and follow with a liver cleanse (that seems to be a generally good idea here). But I would also like to try a juice or water diet/fast. My question is really what should I start with? I like the look of the colonix program, and it seems a good place to start for me would be doing that for a few weeks and then adding parasite cleanse, and then after two months of colonix, doing a liver flush. After seeing the results of that, figuring out my next step.

But I just want to know from some of the more experienced people here: is going straight to a Bowel Cleanse program the best way to start, or should I try changing my diet first? Right now I've been trying to drink lots and LOTS of water, and eating less and smaller meals, but it's not entirely practical for me to try totally changing my diet: some days I only get 15 minutes for lunch, and eating a sandwich is literally my only option.