Camtasia - Video editing and Graphics/Animation

I have recently bought a green screen and I wanted someone to help teach me how to edit the green screen out of the video and to add in a different background.

I watched some videos of how to do it and I have been able to remove the green though not 100? - I need more advanced help.

Long-term I am looking for a brilliant video editor. You must be able to create stylish and content/brand related graphics to create interest and to engage the viewer.

I can upgrade to Camtasia 9 if needed - though hoping that Camtasia 2 will easily do the job.

Expert sound editing experience a big bonus!

Thank you so much.