Need help with posting Backlinks

Hi, Im a little new to SCRAPEBOX. Running Dedicated server and have 100 proxies.

I want to post backlinks, but dont know where ?

Do I keyword search blogs about (industry) or business type, the just continually add to the blog list ?

I get a lot of posting errors and barely have any backlinks / trackbacks posted ?

Any clarity on how to do this would be great.

As to what to use, use any keywords you like. Sure start with your industry and scrape. You may not need all these, but this video series should answer a lot of your questions

https://www.youtube.com/playlist?list=PLd2GyqDU6SSwBGVROdFI9jS4WPTODl-vB