Having link, means only that your ethernet card can communicate with another. Accessing the internet requires that your computer have assigned IP address, the step I guess you missed. Depending on your distro having scripts for automated configuration and your provider having DHCP server, the kernel, detecting the link may trigger the autoconfiguration. Or it may be necessary to do it manually. Anyway, try this as root:
$ ethtool eth0
look at the last line "Link detected ..."
If "Yes", then try:
$ ifup eth0
See the man pages for "ethtool", "ifup", and, most important - "ifconfig"
And, it will be "eth0" if the wirelless card is the first or the only installed ethernet card installed. If you also have another, it may be "eth1".