Setting up Ultima Online Is relatively simple, first download the Ultima Online Mondain's Legacy client, you can find a list of mirrors at the bottom of this post. After Installing your client, run It for the first time and let It update, this process may take up to an hour depending on the speed of your network.
After you have the latest updates, close your client and Install
UOGateway
This removes the encryption from your client, and allows you to connect to the server. After that's Installed and your Inside UOGateway, click the New Local Server tab towards the top, and proceed to fill out the page with the following Info:
Server Name: Enders UO - Valhalla
Description: Enders Ultima Online server -
www.bnet.tog.net
Server dns/ip and port: uo.bnet.tog.net 2593
Encryption: Remove Encryption
Leave the rest blank and click 'Save settings', you can now connect by clicking on the server under your 'My Servers' tab. Using the client In 2d mode Is HIGHLY recommended, you can change this In the settings tab of UOGateway.
To create an account just attempt to login with your chosen name/password and the account will be created. REMEMBERONLY ONE ACCOUNT IS ALLOWED PER IP.
Client mirrors:
UO Mondain's Legacy Mirror 1
NOTE: At this time the server Is still EXPERIMENTAL and will be constantly changing, If you'd like to give your Input on server development please do so In the UO Development forum!
ORIGIN has a long, Informative new player guide available
here, It Is highly suggested for new players.