I generally find Mark's views insightful and see nothing wrong with buying fairly cheap U.S. large caps. But this is advice, not Ned Davis Research's (the firm has a more positive view on equities). I do not believe that the indicator is flashing a red 'SELL' signal. Actually, I believe that the indicator is likely to fall back into safer territory in the coming months even in the absence of market declines:
But what you do with the thousand is as important as what you don't do. For a beginning investor, one of the most important goals should be to keep costs low, diversify and invest in line with your personal risk tolerance.