You can "import" your host machine into a file - but you'd need to have spare disk really to do it, as you shouldnt try importing a disk you're trying to write the files to!
its a wizard, you should be able to follow it through without any major issue.
Differences between server and workstaiton, server is a lesser product, despite how the name semi implies, however, it is more suited to having vms run without user intervention, eg you want them to come up when the machine starts, and shutdown safely when the machine is shutdown. However, server doesnt have all the features of workstation, such as teams, multiple snapshots etc. So best answer is to read through the feature matrixes of both products.
