Wax مہر
Paper (You could use regular paper and give it a tea/coffee effect یا آپ could use parchment paper. (I used the parchment)
These Harry Potter FREE Fonts found here. (You can pick and choose which ones آپ 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 آپ that آپ have been accepted at Hogwarts School of Witchcraft and Wizardry. Please find enclosed a فہرست of all necessary کتابیں and equipment. Term begins on September 1. We await your owl سے طرف کی no later than July 31.
Yours sincerely,
Minerva McGonagall
Deputy Headmistress

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

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

1 wand
1 cauldron (pewter, standard size 2)
1 set glass یا crystal phials
1 telescope
1 set brass scales
Students may also bring an owl یا a cat یا a toad.

آپ can copy and paste the above wording into a Word document. Don't forget to personalize the letter before printing یا to give Professor McGonalgall an مرکت, ایمرلڈ signature. آپ can also copy the image of the Hogwarts مہر and paste into a word document.

Once آپ have it on your Word document and آپ have downloaded the fonts آپ can change the font of wording. Remember, there is no one way to do this. آپ 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
سٹریٹ, گلی address: 123 Water Street
City, State: New York, New York
Country: USA

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

Then آپ can copy and paste the مہر 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.

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