I have been in the Information Technology for around 18
years. I left my last job and now I am planning to start an e-business 
initiative. Nevertheless as my e-business experience is not so wide I
would like to have the outline of the current business opportunities in that
area.
So, I am interested in having 6 alternatives to invest from US$1,000
to US$20,000 each. As a example: setting a website interesting enough
with sponsored links.
I am not in the US, so I would prefer three alternatives with local
scope (Peru and neighbour countries) and the other three with
worldwide scope? I would expect to recover my investment in one year
and make profits from then on.

What I would expect is a business outline for each case.

Just as a curious note, may an initiative like answers.google done in
spanish could be succesful and in the proposed range of investment?

Though you may want something local, the internet is "your oyster". 
Consider a US online business, build a site, advertise with pay per
clicks at first while you optimize your site, seek out top ten
placement companies, find a company that drop ships so you don't have
to inventory alot of product.
Try http://www.sales.natlong.com (Natural longevity is in pre-launch
so you get a great position but the company is worldwide and not just
the average products) and http://www.onlinechristianbusiness.com  you
don't have to be in the US to target those in the US looking for a way
to fund their missionaries.  Also there are those in the military all
over looking for products.