What to do when you invite someone round, how to set the table, how to arrange the seating. 
A few simple rules for you to remember. 

7	About parties and gifts

There are those that deal with holiday celebrations by delegating their organisation to specialised and expert caterers, and even if these don't save on expenses, they certainly save headaches and worries. There are, however, those that own spacious houses and possess great enthusiasm, and prefer to celebrate Christmas and the New Year at home, sending out printed invitations.

When buying a gift one must not bear in mind one's own preferences, but those of whoever is to receive the present. If unsure of what to buy, people who know the person in question can be asked for advice.
Appropriate presents must be chosen with tact: for example it is not good manners to buy a present beyond ones means for a wealthy person, this would only cause great embarrassment, just as neither should one buy an inexpensive gift for someone less wealthy.
It is thus better to buy a small, but amusing gift for someone who is well off, and a small but valuable gift for someone who is less well off.

Usually whoever receives the gift opens it immediately showing, in any case (surprise). 
If not everyone arrives with a gift, those that have brought one should be thanked separately, telling them you will open the gift as soon as possible and then thank them by telephone the next day.