Yes! If you are looking for a Wireless Router then I'd suggest a Netgear one, they have an auto-setup wizard to help you configure it, very simple. They also have detailed instructions in the user manual.
From the sounds of it, you have a dial-up or ISDN internet connection, as your modem only has a USB port. Sharing of this connection is possible, using Microsoft ICS - Internet Connection Sharing.
For the current cost of your ISDN, plus the cost of a new wireless modem, it might be easier (maybe even cheaper) to upgrade to a basic broadband package. Many ISPs give free wireless modems to entice new customers. It would be worth looking into.