According to my own exp, for my small niche sites, I'd like to create 100% backlinks directly to the homepage on a randomly order with a slow pace to make my backlinking look natural. Also, you should focus on the QUALITY OF THE BACKLINKS, not the quantity. A few in-context link from GOV and EDU sites might be powerful than hundreds of PR0-1 links.
"We Will Become What We Think About"