Information is sparse because the methods of buying bitcoins are diverse and highly dependent on where you live. This is a good site that breaks it down by (some) countries and the most common methods. http://howdoyoubuybitcoins.com There is no single tutorial on buying bitcoins because there is no single method that will work for everyone, except maybe "find some one on localbitcoins.com and make an in-person cash purchase", but even then, some people might live in far off places with no local bitcoin merchants.