As shown in the above figure, take 3mm guide inside
from all four sides for margin.
You can type the text from the left margin or you
can type the text anywhere and then place it according to the placement
and design you have decided. It should not go beyond any four margins.
It is advisable to type the relevant text in the form
of continuous block or in single hanger. It means, the address should
be in a separate block than the name and phone number. This way,
you can move the address anywhere and fix it to the proper place
or even experiment by placing it on different places. Similarly,
keep your name, company name in a separate block.