It's different for everyone, just like periods are different for everyone
I will let you know, though, that there *could* be large-ish clots the first day or two. They tell you this in books, but they don't really give you an idea as to HOW large. (TMI ALERT) I passed one the size of my fist, and I thought my uterus fell out! I called my midwife and she said that was normal, as long as I didn't pass a LOT of them (I only passed that one). One of my clients gave me a big box of super maxi pads as a gift, and I thought that was silly... I ended up using every last one of those pads
If I recall correctly (I last gave birth 5.5 years ago), the lochia lasted about 4 weeks. It was not heavy that whole time... just in the beginning it was like a heavy period, then it ended up lighter, but still there. I do not remember it being crampy at all.
No idea on the csec stuff, never had one, and don't plan on it!