1. you can use the /jump to command
ex /jump to 31670 27908 22893 249
that will port you to Alb DF ent; list of some jump points can be found
here
2. depending on what DB you use, they will be available in their respective tables
latest DB release
3. based on what I've read, you have to add scripts for custom classes...search forum for a better answer, I'm trying to figure it out myself ._.
4. I know i've read how to do it somewhere, search forum