SSH is enabled by default only for Raspbian releases before November 2016 but the boot protocol for the ethernet interface is set to DHCP by default so the IP address will be assigned by your router. You can find the open SSH ports on your network using the nmap utility:
nmap -p 22 --open -sV 192.168.1.0/24
You should find your pi listed in the output along with the IP assigned to the pi.
You can change the boot protocol to static and define a static IP address for the pi by editing the ifcfg-eth0 file:
Then edit the file to suit your needs