The easiest way for runner:
Select your faction and neutral, and select all card types. They say yes to everything, except the few neutral cards that cost influence. Once you are done with that, choose how you are spending your influence. (Then, if you are The Professor, select the other factions and add one of each program you don’t have already).
The easiest way for corp:
Select your faction and neutral, and select agendas. Say yes to everything (unless you are Jinteki in which case you need to choose between GFI and Obokata). Then keep adding cards until your deck reads as legal (HB is a measly 439, Jinteki wants 459, NBN wants 474 cards, Weyland wants 484 cards). I would advise doing a first pass just saying yes to every card you think is vaguely good, and modify from there.