Dear Jill,
Thanks for your letter. I am happy to hear from you again. Sorry, i haven't write you earlier as i was steeped in my studies.
To tell you the truth, i am not so professional in arranging parties, but i will try to help you. I think that food should be both delicious and easy to cook. I advice you to offer guests various kinds of desserts. I consider that party should be outdoors, if weather is fine as guests will be able to enjoy it. Besides, outdoors you can offer more entertainments. For example, some running or jumping competitions.
Well , i hope my advices will help you ! But now i have conclude my letter as my father needs my help.
Fondly, ( имя)
P.s в правом верхнем углу нужно также написать адрес