Supplies:
Paper (You could use regular paper and give it a tea/coffee effect or you could use parchment paper. (I used the parchment)
These Harry Potter FREE Fonts found here. (You can pick and choose which ones you want. There is no wrong way to do this, I promise)
Address Labels (this is to print out a faux wax seal)
Twine (optional)

Find out more...

The first page of the acceptance letter says:

Hogwarts School of Witchcraft and Wizardry
Headmaster: Albus Dumbledore (Order of Merlin, First Class, Grand Sorc., Chf. Warlock, Supreme Mugwump, International Confed. of Wizards)
Dear (Your name)

We are pleased to inform you that you have been accepted at Hogwarts School of Witchcraft and Wizardry. Please find enclosed a list of all necessary books and equipment. Term begins on September 1. We await your owl por no later than July 31.
Yours sincerely,
Minerva McGonagall
Deputy Headmistress


The segundo page with requirements says:
Hogwarts School of Witchcraft and Wizardry
UNIFORM
First-year students will require:
1.Three sets of plain work robes (black)
2.One plain pointed hat (black) for dia wear
3.One pair of protective gloves (dragon hide or similar)
4.One winter capa (black, with silver fastenings)
Please note that all pupils' clothes should carry name tags.


COURSE BOOKS
All students should have a copy of each of the following:
The Standard Book of Spells (Grade 1) por Miranda Goshawk
A History of Magic por Bathilda Bagshot
Magical Theory por Adalbert Waffling
A Beginner's Guide to Transfiguration por Emeric Switch
One Thousand Magical Herbs and Fungi por Phyllida Spore
Magical Drafts and Potions por Arsenius Jigger
Fantastic Beasts and Where to Find Them por Newt Scamander
The Dark Forces: A Guide to Self-Protection por Quentin Trimble


OTHER EQUIPMENT
1 wand
1 cauldron (pewter, standard size 2)
1 set glass or crystal phials
1 telescope
1 set brass scales
Students may also bring an owl OR a cat OR a toad.
PARENTS ARE REMINDED THAT FIRST YEARS ARE NOT ALLOWED THEIR OWN BROOMSTICKS

Instructions:
You can copy and paste the above wording into a Word document. Don't forget to personalize the letter before printing or to give Professor McGonalgall an esmeralda signature. You can also copy the image of the Hogwarts foca, selo and paste into a word document.

Once you have it on your Word document and you have downloaded the fonts you can change the font of wording. Remember, there is no one way to do this. You can choose any font to use.

The envelope could have the following information:
Name: Mr. T. PAIN
Bedroom location: On a boat, on a big blue watery road
rua address: 123 Water Street
City, State: New York, New York
Country: USA

This, of course, is an example. You would put in your info. You could use a regular envelope or make one from paper using a tutorial like this.

Then you can copy and paste the foca, selo below and print it out on an address label. Cut it out and use it on the back of the envelope as if it were a real wax seal.

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{Credit : www.hellopapermoon.com/2012/06/hogwarts-here-i-come.html }