Take a look at the resources on the website <a href="http://searchsecurity.techtarget.com/">SearchSecurity</a>. You might also should consider the <a href="http://certification.comptia.org/security">CompTIA Security+</a> coursework and certification.
(WS) The simplest thing I can tell you is to ditch WEP and go for WPA2. You should also look into getting a universally applied antivirus as well as a commercial firewall, as they have the hardware and software to improve/establish network security.
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How much do you want to secure, is the basic question. If it is clear, then you can draw out your network policies and put them in place. This will include – user rights, network cofig, DNS, access control, antivirus policies, browser policies, internet access…
may be this will help you
http://itknowledgeexchange.techtarget.com/network-technologies/sample-it-secuirty-network-security/
Firewalls are also important in network security. It’s as simple as doing a search on google.com. You might want to check out NetGear firewalls or WatchDog firewalls.