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I am unable to share files because my personal firewall is not configured to allow Limewire connections. I would like to customize it to accept connections but I am unsure of what protocol (TCP, UDP, ICMP, IGMP) or port number/interval to use. I am also given a choice of whether or not to "allow broadcast packets". I am new to this firewall stuff so any help would be appreciated.

Checkout the LW FAQ - there is a section on Firewalls - it may help :)

http://www.limewire.com/index.jsp/faqs

If your firewall uses network address translation to tranlate your local ip to a internet global ip you will have to go into the tools-options menu, click on firewalls, fill in force local ip with the global ip address provided by your isp. Make sure your router/firewall is port forwarding 6346 to your local ip. Example 10.0.0.1. This should open up a hole for other users to download files from you. If your isp uses DHCP, you can go to grc.com, run shields-up and it will tell you your ip address to force.