Setting up a wireless router

I am setting up some of my office wireless we are already setup hard wire with a domain and a dhcp server I bought my linksys wireless router from home to the office to test it out before I purchase a wireless router the problem I had was the routerwas a dhcp server also it was trying to give the systems their own IP address and I need them to stay in the rage of ip address on our network should I not use a router and use a (if any) a wireless hub?? Can some one point me in the right direstion on what or how I can set up some on my office wireless and what should I use a hub or router? E-mail me