without a display...
well you could connect the apex up to your network then you need to figure out the ip address. that's where having the display would be useful, but you could still login into your router and figure out which ip it assigned to your apex. next up you can connect to the apex from your computer (through a browser) and hope the login/pass is set to default or if you ask for the login/password if you bought it from someone. after that you have full access and can set it all up like normal