Hello,
With my VPS experience, I postulate for the job. Myself being a web hosting I have two vps at LWS and the services are very fine.
I can install your VPS with all service but I suggest using ISPConfig but it's very simple manager for web hosting, I use ISPConfig the past 6 years without problem.
You can add customer, setting the quota for website, e-mail and others.
I can help you at first time to manage your service and configure your master name domain for redirect to your VPS (Name Server - Child Name Server (For your customer). DNS Records (A - MX - CNAME - ...)
I can give you an access in customer panel for testing ISPConfig.
For backup, ISPConfig integrate this function.
Waiting for a response from you, best regards. Thank you.
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Iaina Randrianarivony