My sentence is: "Our generation work (because "generation" is a collective noun and here I use it in the plural) mainly on computers, we/they/it do(es) not need...". Which pronoun should I use?
The phrase "our generation", like any group including first person plural (our family, our team, etc.), can be substituted by the pronoun WE.
Look at some examples from Reverso.context.net:
And then, like everyone else in our generation, we went to live in a Himalayan monastery.
In our generation, we cannot be expected to complete the monumental task which lies before us, but neither are we at liberty to abstain from it.
Posterity will not spare its judgement on our generation if we do not rise to this challenge.