Yes, it can all be confusing - Lori is giving her usual very good advice! Here is what I do - on Friday I check this board first and see what is "new" like a pin or furniture. Then I go and buy it - usually the emporium might have it - under "specials," like Lori said, or if it is somewhere else, someone on the board here will know and tell you where it is.
The host games - when you get into VMK on the bottom where your little globe icon is, click on that and then click guest rooms and the host game will usually be the top room listed - it will say Host_Hula or Host_someone else - in other words, the word host will be there. If no word host is there, it is not the prize room. Go in the room (but they are hard to get in) and follow the directions to get a pin or some prize.
The quests - if there is a new quest it will be at the bottom of your screen under the "Q" button - just go through and do all the quests. When there is a new one, you will see it added onto the end of your old choices.
Good luck!