taking the plunge

Background:

I'm a newbie.  I've got  just over $300K to invest long-term, and need
to generate about $1500.00 gross per month for needed additional
income.  I don't want to attack principal (who does?), and would like
to see moderate growth over the next 15 years or so.

I've seen two investment counselors who've recommended many mutuals of
which the primary is American Funds.  The load is far too high, IMO.

I'm leaning heavily toward Vanguard Index Funds, but am at a loss as
to how I should divide up this moderate amount of money.  Moderate
risk is okay, but I'm not sure how realistic this whole scenario
is in light of the fund scandals, market flakiness, etc.

I do realize that free advice is worth exactly what you pay for it,
but I would like some voices to chime in on what direction I should
take.

Of course, thank you for any and all answers in advance.