Yes the search function is your friend.
1. It depends on where you buy it. If you get it from one of out sponsors than it most likely will. If you get it from ebay then it probably won't.
2. It depends again on who you buy it from and whether or not it's a "complete" swap or not.
3. You won't be able to use any of the actual ka engine parts (maybe the a/c comp, i don't know for sure) but stuff like engine harness, power steering lines, driveshaft etc you will need.
4.
http://www.srswap.com/faq/index.aspThis link will answer all of your other questions.