Please tell me if this will work...

Hello and thank you so much for your time, I'm a newbie but very willing to learn and do the work, I just need the go ahead from you guys.

My equipment:

one WiFi 4 port router LINKSYS E1200
one WiFi 4 port router D LINK DIR 614
one non wireless 4 port router D LINK DI 604

one 4 camera security system with it's own DVR
300 Meters of Cat 6e Ethernet cable


What I want to do is:

A: To connect LAN 1 to LAN 2 such that I can view the CCTV cameras connected to LAN 2 from LAN 1 without lag.

B: To share the ADSL internet line connected to LAN 1 on LAN 2.


My simple question is can this be done. If it can than I will do the research and find out how to set it up.

The distance between LAN 1 and LAN 2 is 300 meters (900 feet) so do I just need to put one repeater in between? There is only one cable between these two location and not possible to draw another cable.


The picture below explains better what I want to do...



NOTE:
The reason there are two routers in LAN 2 is that the DVR+PC2+PC3 are located 50 meters away from PC1 and where the 300m cable from LAN 1 is located.

I Thank you all so very much in advance.