Hi Waheed, here are my answers:
1- I don't know of any bevel plug-ins, but, basically, when you extrude your bevel edge and it looses its curvature, simply choose those cps and click on the smoothe button (which is above the peak button on the right).
2- That problem is eliminated in v13 (I think).
3- I personally like the QT training videos that Hash has on line, but the majority of others have them displayed on a web page.