Do I Need to Use a Network Switch / How to Configure

[techlists at phpcoderusa.com]

Hi,

I home office and have a home office Internet connection which allows me 
to run servers.

I am using a consumer grade router that has WIFI and 4 RJ11 ports.  
Currently I need 6 RJ11 connects.  Not everything is turned on all the 
time.

My research suggests I add a network switch to the mix.

I assume I would keep the connection to the modem to the router and 
connect one of the RJ11 ports to a switch and connect all my devices to 
the switch, leaving the other 3 RJ11 ports on my router not connected.

If this is actuate, any suggestions on a "consumer" grade 10 ports 
switch?  Or would a more commercial switch be better?

Thank you so much!!
Keith