IPs, Nameservers. Hostname

I'm getting a VPS /w two IPs, how should I use them?

IP1 -> NS1, Server IP, Main hosting Site
IP2 -> NS2, Shared Hosting, Reseller Hosting?

When a mail goes out, how does the ip work? is it traced back differently for each location of the website, I want to avoid company mail being blacklisted because a custoemr site spammed...

Any recommendations?

What about host names, any recomemndations? or just NS1, NS2 or someting else,

Thanks for the help!

 

 

 

 

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