Should I rewrite or Copypaste for my blog niche download? Please Answer!

well..today i wanna ask you about google seo on blog download!
I want to build a blogspot with niche download software..what should I do to get rank 1 on google first page?
If I copypaste like description software on their official site,does it bad for my blog?
and how many percent should I rewrite if I do copypaste?

Please answer if you Knew Don't be Silent Reader