Check out how to configure the pis boot config.txt and perhaps the wpa_supplicant.conf file. These two if you change them you can set it up so the pi knows what address to connect to so you can have easy access. Since you're using lan though you might need to learn how to edit the ex eth0(Ethernet 0 port on the pi) by changing the file using vi or nano to /etc/network/interfaces/eth0.conf or something akin. If you end up needing to edit this file you just need to set a ip address and subject mask ex(255.255.255.0) and once you change that file and then the interface off and back on using sudo ifdown eth0 then sudo ifup eth0 it should kick in.

The problem is I think because you haven't booted into the pi yet it may not generate the file for you so you may have to create this from scratch and use a reference online. If you need one I can post one.