The support from the Reagan administration distorts our understanding of them. The Contras were a diverse group, unified only in what they were against. They certainly were not uniformly right-wing by any measure and drew the largest share of their popular support from (often indigenous) peasants.
The largest group by far (the so called Nicaraguan Democratic Force) was comprised by members of the Somoza's National Guard (notorious criminals) and an organisation of emigrés based in Miami (mainly businessmen and professionals). That force operated in the northern border and had the support of a few Miskito people, but the 'indigenous resistance' mostly vanished by 1987 when the government granted autonomy to that community. There was a smaller group operating from the south led by Edén Pastora, aka Comandante Zero, which was less relevant in what regards the 'military operations'. Check Psychological Operations in Guerrilla Warfare.
The Contras were tied to drug traffickers, according to this:
http://nsarchive.gwu.edu/NSAEBB/NSAEBB2/nsaebb2.htm
However, that is of little importance. Every terrorist is a freedom fighter, according to some.
FDN was formed through an alliance encouraged by the US between the Somoza Guard and MILPAS - a Sandanista breakaway group that gathered its support among peasants from the mountain region. The latter group were far more numerous.
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