Make it PVP by changing the ServerType variable in the variables table to 1 (That's off the top of my head, I think that's right). Easy shmeazy.
As for restricting PVP to that level range... There may be another way, but the only one I can think of at the moment is to edit the code and recompile. You're probably looking for a function in zone/aggro.cpp called something like 'IsTargetAttackable.' It returns a boolean value, true if the target can be attacked and false if not. You would just need to add something like:
If the absolute value of myLevel - yourLevel is greater than 10, return false.
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