My lead generation idea, Is it feasible?

So a while back I had a job interview with a company, I can't say exactly what it is they do but its a buy and sell operation in an extremely weird niche.

I found out a lot about how they worked in there, what they look for in their purchases etc etc

I've now made a list of companies in the same niche, these are as such my potential buyers for my leads,

Because of what I found out in my interview, i knew exactly what kind of businesses could use this service, and the list is endless, There's so many potential leads in my country alone.

I've seen a lot of great things about lead generation on here,as long as hard work is put in and you think outside of the box then you'll generally get something.

Is this just a stupid idea of mine or am i being mildly smart

Give it a shot. Set a reasonable budget to test your theories. If it works, great! If not, well at least you tried. I'm there right now with a company idea. Reasonable budget and fingers crossed.

in which niche you are generating the leads?