AFAIK the PlusNet trial isn't open to new participants - so you'll just have to wait (don't hold your breath) until they sort out the first "live" services.
In the meantime, you may want to head over to
http://tunnelbroker.net where you can get an easy to use tunnel to get onlline right now. It;s also worth signing up for their "certification" which will force you to learn all the basics you'll need - a step at a time.
