The worst and possibly more expensive part of a journey is getting out of the UK. LOL
the best website I have ever found for trains (mainly) is www.seat61.com.
It talks about train timetables, destinations etc for nearly every country in the world. For example I used it when I went back packing around SE Asia a few years back.
Custom tour sites I find more pricey, for instance by train from Bournemouth area to Rome would be about £650 return by train.
There are coaches but at present I cannot find a "period" travel ticket that allows you to hop on / off.
Only a little help but hope it does anyway.
Learn from yesterday, live for today, hope is for tomorrow else what is left if you remove a mans hope.