Here's the conventional advice. Start with it all in cash, in some form you feel is sufficiently safe from disasters. Gradually over a couple years bleed it into some combination of stocks (by default in a low-cost index fund) and bonds. The usual rule of thumb is to put your age percentage in bonds. I.e. at age 30 you should have 30% bonds.
This is a little un-related, but the more I read HN and actively listen the more I think of a y-combinator like org in Nairobi Kenya. Ideas are many but angels scarce.
