Sharni~ Check out that link there. You can make each class into different builds. Such as an axe barb, sword barb, fire sorc, cold sorc, yadada...But also you cant take single player chars into closed realm battlenet. You can into open battlenet.

Here are some other links you may want to look at:
http://www.battle.net/diablo2exp/basics/

http://www.blizzard.com/diablo2exp/

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