Congratulations, Beautiful machine! Here's an essential for getting your White in working order:
http://www.ismacs.net/white/manuals/white-rotary.pdf
Best to stick to the oiling and cleaning rather than taking apart, unless something is broken. Can't say I'm real familiar with Whites but I believe they take a 20x1 needle or some lower a 15x1.
Good Luck and Enjoy
Jon