You might find this post helpful
Returning To Sitebuilding After A Break? Need Some Help? Updated 2017https://forums.sitesell.com/viewtopic.php?f=75&t=214173
There have been lots of changes to SBI recently and the AG has been updated to reflect those changes. As always follow the AG and pop back to the forums when you need help.
There's a forum for everything, I have been able to answer your questions in this post but it's usually best to try to find the forum that is the best fit for your questions so you can get answers as quickly as possible. Don't worry if your not sure, just put up your post and a mod will move it if necessary.
Yes you can use move it to redirect to a shorter domain name.
Here's the help http://help.sitesell.com/moveit/move-it.html
Your details will be public on WHOIS unless you have already made them private. I just ignore the spam emails, I don't answer calls anyway as I'm deaf so they don't bother me. If you haven't already you can make this private if you wish, here's a post about the pro's and cons. http://sbitips.sitesell.com/privacy-contact.html
I hope that helps,