You don't have to switch to 1.7. Most of the servers in sandlot are 1.8. You can leave your client at 1.8.x
For Server Name, you can put whatever you want. I would recommend "The Sandlot - Family Friendly Server" For Server Address, you use: server.sandlotminecraft.com
best if u find the address at http://www.sandlotminecraft.com/index.php?threads/getting-started.15555/ uhh biz i put the name as Good king Whatzhisface TSMC
Please check the section on our FAQ called "How do I connect to The Sandlot / What is the Server Address?" which can be found here: http://www.sandlotminecraft.com/ind...-questions-read-this-first.23541/#post-165750