Serene of the Oakland Serenes

I have a friend who is studying for the Level 3 Japanese qualification offered by their government... hope this is helpful:

"a) Is this going to be spoken or a written letter?
b) Is the other person older / more senior, or younger / junior?

I've written it as if it were a letter

[to person's name] he
To [name],

shinsetsu ni shitekurete, doumo arigatou gozaimasu.
For your kindness, thank you very much.

kore ha presento desu.
Here is a present. (Yes they really do use the word present in this
situation)

sore kara, watashi ha hachi gatsu ni tokyo kara hagaki wo okurimasu.
[after present-giving], I will in August from Tokyo a postcard send.

Serene yori
from Serene"