Your supervisor MAY turn out to be your mentor, and maybe not. You may find someone else to be your mentor. There is no requirement that one person serve in both roles. Both can dramatically impact your experience as a LANL PD, the mentor providing support, encouragement, guidance, and wise counsel, and the supervisor providing the nuts and bolts means of getting things done. Job searches A big part of your job as a PD is getting the next job, either here at LANL or elsewhere.
Many people go on to academic careers.
And many people go into jobs in business and industry. Part of your task is to figure out which way you want to go and then pursue it with a vengeance. We list here some links to LANL, academic and industry job listings. Consult the section on Books for a listing of a few books you might find useful in your job search.