Heya - Yes, MB's are primarily liquid, but some of it should be brown, indicating that a little more is getting cleaned out each day. That's what the cleanse does!
As for eating, you break with juice, such as OJ (or 1/2 oj 1/2 water if oj is too strong), move to veggie broth, then fruit, then veggie soup (soft veggies) over the course of about 3 days (for a 10 day fast). There are archives with suggestions for soup - recommend you search for the cauliflower soup recipe - it's awesome. :)