Need advice setting up a small wireless office network

I hope I don't get blasted. I am needing some advice/information on how I should set up wireless network for a small business w/about 5 pc's. I had some concerns about whether to use a hub or a router, but since learning that the only need for a router would be if I have more than one IP address provided by an ISP. Is that correct? I need to know once this network is set up, what is the maximum number of pc's that would be able to be added if they decide to add more machines? Could I go w/a hub, if only one IP is being used through ISP, then connect a WAP. I'm open to all suggestions. Be gentle.

Um you have the router thing backwards. You want to use a router BECAUSE you only get one ip address from your ISP. The router using nat [network address translation] is able to give as many pcs as you have ports access to the internet using just that one ISP's ip address.

Normally wireless routers come with 5 switch ports. You can use a crossover or uplink port on another switch to connect to the router switch thereby increasing your port count.

Thanks for the information, sorry it took so long to respond but I actually forgot the website. LOL.