today my dad and bros were sitting together and were dicussing advertisment of DSL and were seriusly considering to get one (no one of them use internet in house only i do ) until i poped in with idea of Smugmug pro account that will cost 50% less then DSL per year. And they were agreed .

But i don't know if i need it or not one thing i see is i can take advantage in some university project related to Marketing in coming semesters by online photo compitition of university photo nutts .I know i can sell images with it but i am not sure if i will able to sell.

one question i have is that what is domain name thing ? i have to register it somewhere else other then smugmug ? like one of my friend is giving .com for for about 10$.

Is there a possibility to degrade from pro to power account after 1 or 2 years ?

Awais, you have a pro account :)

The domain CNAME thing is optional.

More, here: http://www.smugmug.com/help/professional-accounts