Expired Domains, What should I Check?

Hi guys,

I am trying to build myself a PBN, and right now im at step 1, when i should buy expired domains. Can you tell me what things i should take in consideration before buying a domain? And what tools and stuff i should use when doing this research?

Thanks!

I find this topic very useful with a youtube guide: http://www.blackhatworld.com/blackh...de-how-find-high-da-expired-domains-free.html