Most of your questions are answered at
@fohdeesha's guide, which gives you detailed instructions for flashing the boot and firmware images on the switch and setting up a basic configuration, among many other things. He also provides a zip file you can download; this contains the boot/firmware images and documentation.
fohdeesha.com
Think of the 6610 as having three banks of ports: one bank is the 48 x 1G ports on the front panel, another bank is the 8 x SFP/SFP+ ports on the front panel, the last bank is the 4 x 40G ports on the back of the switch (two of which require breakout cables to give you 8 x SFP/SFP+ ports). All three banks are independent of each other and you can use all of the ports in each bank simultaneously, i.e., using a particular port does not disable any other ports.
You can certainly use a 10GBASE-T transceiver in the front SFP/SFP+ ports to attach a copper 10G connection. FWIW, my understanding is that these run hotter than fiber or passive transceivers.
You don't have to configure IP addresses on the ports, though you
can configure the switch to provide IP addresses via DHCP, if desired. I don't use the switch for DHCP; I use pfSense. I assign static IP addresses to nearly all of my machines anyway. Basically, you just plug your devices in.
You'll need to connect to the switch either via the serial console or an SSH session (both are covered in
@fohdeesha's guide above) to set up the switch, including licensing.
This is a massive thread and there's an immense amount of good information here posted by some smart folks who know what they're doing. I've learned a lot by poring over it, which I've done more than once.