1) How you would like your subscriber data delimited? 
Users may be imported in a 
comma-delimited (CSV) text file, one user per line.
There can be up to 13 fields per line in the file. (first, last, email, + 10 custom).
2) Would you like "Quotes" around your subscriber data?
I don't use them so I would say no.  My imports work great without them.