The "standard" for print profiling and proofing is D50. But it would ultimately depend on where your work will be displayed. If most of your work will be displayed outside - car wraps, outdoor signage, etc. - then I woiuld go with D65 myself. If you really want accuracy in color matching, then getting a
proofing booth would be worth the investment. It's not just the lights in the area, but also the surrounding environment will impact how you perceive color.
But is is good that you're thinking about this now. I've been in print shops that have 3 or 4 different colors of lamps in their fixtures, so color matching visually is a real crap shoot.
Good Luck