I would strongly caution against running an evil campaign with first time players as an inexperienced DM.
Evil characters sound fun, and look cool on paper, but are extremely challenging to play without causing unpleasant conflicts within the group dynamic.
Without wanting to sound alarmist, I predict your campaign will have a very short life expectation because even well role-played evil characters will have selfish goals that don't encourage team play.

I advise you all to cut your teeth on a more typical party build and get the hang of cooperative storytelling before embarking on an evil campaign.