Home and Office network

Hi All

Happy NY!

I am using some of my time off to set-up a wee network.

A working system is in place and I would like to add a linksys wrt54g(DD_WRT) with a vpn for 2 outlets, the Samsung TV and the office workstation.

I have added a sketch though not sure how to go about setting up the wrt54g(dd-wrt) and if I can place(wps) it in the red position?

Thanks