Setup r6700

> [...] Can I connect router to my laptop and do the setup without
> wizard? What cabling? Just the Ethernet cable? [...]

   As I said, I'd expect a virgin router to start with its set-up wizard
showing, but I'd also expect it to give you a chance to do a manual
configuration eventually.

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> [...] Get the User Manual (at least).  Read.

   Did you?  Look for "Use the Internet Setup Wizard" and "Manually set
up the Internet connection".

> [...] Still trying to decide on an ISP. [...]

   Ok, so there's no real Internet Setup to do.  All you need to do is
get past the "Wizard", and proceed.

> [...] What cabling? Just the Ethernet cable? [...]

   Some or none, it's all the same to me.

> [...] Get the User Manual (at least).  Read.

   Did you?  As the User Manual says ("Connect to the network"):

      You can connect to the router's network througha wired or WiFi
      connection.

   These routers tend to expect access to a time server.  They typically
don't offer a manual way to set the date+time, so, without an Internet
connection, the date+time data in its logs may be inaccurate.  I
wouldn't expect "Set up a WiFi schedule" to work well.  Similarly,
features like automatic firmware updates couldn't work.  Otherwise, for
LAN-only operation, what could go wrong?