1. The first few days, it can hurt real bad, but that's just me.
2. It can be VERY irregular! I've had mine for about 2 years and I STILL don't know when mine's coming. The longest span between two of mine was about 3 or 4 months!
3. Yes. If it's the clear discharge, yes. Period blood tends to take a few days to go away, so wear a pad even after you think you've ended.
4. I am guessing Knight's answer.
5. Then don't sweat it. Every girl has it. Don't feel comfortable around at home because of it, but be careful in public.
6. NO! It's an "awesome" thing (I guess XD). It's not gross, but can be uncomfortable. A steady period means you're ready to have kids! (But don't think that means it's TIME to have kids. Get married and mature into a smarter and hardier person first XD)