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I'm new to DSLR and have a 60d, and would like to get a 100-400L IS, will it fit, focus,ect?
What about extension tubes and converters? Or even a 24-70L IS?
Lots of 'advice' given so far, I'll add just one suggestion, visit the 'Canon Digital Learning Center', it's FREE and you can learn all things EOS. There are documents and videos that help explain, give you direct how-to advice, etc.
The CDLC is a great resource for beginner to advanced Canon nut case
Here's a link to all things 60D, hope this helps, yes the 100-400 will work on your 60D!
Do enjoy shooting, there's tons of technical stuff to learn, but above all have fun