Yes, you can. If you do so, they become effective with the first pill. If you start them on another day, you should use a back up method of birth control for the first seven days.
That's normal. Just as stopping the active pills (typically after three weeks) leads to period-like withdrawal bleeding, stopping your birth control pills at any time in the cycle may lead to...
12 to 18 days is typical, but this is the part of the menstrual cycle that has the most variation. If your periods are irregular, this number is the hardest to guess. In contrast, the typical...
No, my wife does this as well as not stopping taking the active pill after the 21st day so she can control when her period arrives or not so she can do things without worrying about having a period.