I used to play Diablo/LOD online with my brother, but it was a hassle arranging a time to play and I eventually got bored with the game. I'm not very big on multi-player games.
For the bee/wasp garden the queen bee and the mage/wasp will both approach you and ask for your help. The bees are the good guys, but you can choose to help either (the queen bee will teach you a level of Aura of Command if you kill most of the wasps without hitting any bees). Then make your way through the garden killing whichever side is hostile (use the control key to attack, and avoid area effect spells which could kill allies.
COUNCIL MEMBER SPOILER