Welcome
First off - PATCH!!! It's not like the patches are there to fix horrible bugs, rather they add extra features like skins, higher diff lvls and the ability to use and create custom quests.
Secondly, most new players use the two player mode, but as you get to higher lvls, they tend to concentrate on one char. Just take your time, play around with the chars and get a feel for which style suits you best.
Finally - take things slowly, explore the game and don't be in too much of a rush to play at higher diff lvls.
Happy hunting
------------------
Regards
Mouse