Many people (including myself) experience a huge improvement to their skin in the first week, only to find they have a dreadful breakout in the 2nd/3rd week.
Dry, itchy and red skin are perfectly normal reactions while your skin is getting used to BP, but its important to moisturise and mosturise well and to also make sure you're starting slowly with the BP and not applying to much in the first couple of weeks. If you are finding some patches on your face are dryer and more irritated than others, perhaps apply less BP to those areas and apply more moisturiser. Its perfectly ok to apply more moisturiser throughout the day as you need it, so long as your hands are clean and you apply it with a feather light touch.
As for the moisturiser being brown, its hard to know if this is normal if we don't know what products you're using. Acne.org moisturiser is a yellow colour but definitely not brown.