Ebay, I got a Clymer manual on there a few weeks ago, but there is factory service manual on there now cheap!
http://cgi.ebay.com/ebaymotors/ws/eB...7967455&rd=1,1
chains are an easy job, but if you use a clip link, I would safety wire it, and it will work fine. Are you're sprockets okay? Chain and sprockets should usually be replaced as a set for best wear.