1 & 2. Both depend on the amount of loans you take out, the salary you earn upon graduation, and other parts of your lifestyle. Big loans coupled with a big salary and no mortgage are less of a problem than small loans coupled with a small salary and a mortgage.
3. Virtually impossible (and not allowed) if going full-time, very possible but difficult if going part-time (as I and others are doing.)
4. It depends. Number of credits is really what you should care about, not number of courses. Usually 15 credits per semester full-time, 10-12 credits per semester part-time. Course can be anywhere from 2-5 credits depending on the course and school.
5. No. Except for WI (and only for graduates of WI schools) you have to take and pass the bar exam in the state you first want to practice in. Most states allow you to be admitted to their bar "on motion" once you have a license in another state. Some required a period of practice as well. But you need to look at each state's requirments to be sure.