Hey Brownsfan. Here is just some QUICK replies since the market is currently open. I am sure others will pop in here and answer a little more detailed.
1) Take a look
here
2) Depends on the pair and your lot size.
3) I personally remove money on a regular basis. It depends on the broker. But yes, no account protection like futures.
4) Again, just depends on the lot size you use. FX is very flexible.
Haha, very helpful, I know.

Main reason to post so fast was the link in number one. I have found that to be a good link to show people. If anyone has a better one please share.
Edit: Here is a good link as well. It is the "preschool" section of babypips.com -->
HERE