I would start with Fund 0030 – Vanguard Prime Money Market. It’s fairly safe (would probably be the last MMF to fail) and pays a decent interest rate. Later it will allow you to set up a Dollar Cost Averaging plan into a fund of your choice either with Vanguard or outside through their Brokerage Services. But you don’t have to do that yet – maybe wait for the DOW to hit a certain point before buying back in. (I’m looking for under 7,000 and think it may drop more but that’s when I’ll start buying.)
By all means fund the Roth – You don’t have to invest it now. And with 40 years to go even if you did you would be fine.