Using colors depends upon the type of the card and the cost. More
the colors more the cost is the rule of thumb. Formal cards need
less color. It can be single color card or maximum two colors. The
type of processing is also important. If the photograph is used
for the card then it goes for offset printing. If it is more of
a text with no continuous toned graphic it goes for screen-printing.
The cost of the card is decided on the basis of color impressions.
It is generally impression per thousand cards.
The choice of font depends upon the type of the card. If it is very
formal card like the card of lawyer, doctor etc. Times New Roman
is the best choice. Arial also can be used. If you want to use some
script font, the distance between the characters has to be properly
adjusted by loosing the tracks. Bold and thick font can be used
for company title. Address font is generally the smallest of size
and at the bottom of the card.
As a rule, you should keep good amount of white space in the card.
It can become too crowded if lots and lots of things are added.
The matter has to be chosen very carefully. It has to be short and
precise. Since the sight travels from left to right, the most important
things have to be aligned left if the card is not center aligned.
Sometimes short cuts can be used to save the space i.e. Rd for Road
etc. Horizontal line can be drawn above the address if you desire.
It creates prominent impression. If you are using more than one
address it can be separated with the vertical line.