If you need to ask, you probably need one...
You would need a real estate lawyer to sue a realtor.
It depends on if the seller has a realtor or not. If the seller does have a realtor then they will handle all the paperwork. If the seller does not have a realtor then they need to contact a title attorney and they are capable of handling the selling process.
It depends on what state you live in. I am a property manager in Minnesota and I do not have my realtor's license.
While it is not required to use a realtor to sell your house, having a realtor can provide valuable expertise, guidance, and assistance throughout the selling process.
the only test you need to pass in order to acquire a realtor license is your state's Real Estate License State exam.
In order to get a realtor license in California you need tp take and pass an exam. Check out this website from the California government about the exam: http://www.dre.ca.gov/exm_home.html
This website tells you everything you need to know about getting a realtor license. http://realestatelicensedirect.com/how-to-get-a-real-estate-license/
Rules on becoming a realtor will vary state to state, here is a website with more info on how to obtain your license: http://www.realestateexpress.com/
Yes, you do.
You need to buy some land. Contact a Realtor.
You need to check by region. There is no universal answer to your question.
Realtor agent shall need a legally acquired license, given to them by their state department of real estate which will certify them as real, legally acknowledge as a realtor agent of a company of the regulator.