If any of you are better with wireless networks, can you help me out here? I'm at a loss. I'm terrible at wireless crap.
Okay, so this is how it's currently set up. The internet comes in through the modem, into a 8-port 10/100 switch. From there it goes to everything else, right? But. The switch is full, and I need a wireless router set up on the connection. The issue here is, I need to be able to access everything on the wired 8-port switch from the wireless/4-port router. I know that there is a way, but I don't know exactly how.
Is it something to do with forwarding the IP addresses from the router to the router in the modem somehow?

I know that the modem has an internal router that can be really annoying, but I don't know too much about configuring it.
[MODEM]
\
\
[----SWITCH----] --- 4 ports going to another room
/ | \
/ [COMP1] [PRINTER]
[WIRELESS]
|
[COMP2]
What I need to happen is:
-Be able to hit files from COMP1 from COMP2
-Be able to print from both COMP1 and COMP2
-Have incoming Wireless connections able to access the printer
Any ideas?
For reference, the hardware is
D-Link DI-624 Wireless Router
SpeedStream 4200-Series Modem