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

The সেকেন্ড 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 দিন wear
3.One pair of protective gloves (dragon hide অথবা similar)
4.One winter ছদ্মবেশ (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) দ্বারা Miranda Goshawk
A History of Magic দ্বারা Bathilda Bagshot
Magical Theory দ্বারা Adalbert Waffling
A Beginner's Guide to Transfiguration দ্বারা Emeric Switch
One Thousand Magical Herbs and Fungi দ্বারা Phyllida Spore
Magical Drafts and Potions দ্বারা Arsenius Jigger
Fantastic Beasts and Where to Find Them দ্বারা Newt Scamander
The Dark Forces: A Guide to Self-Protection দ্বারা Quentin Trimble

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

আপনি can copy and paste the above wording into a Word document. Don't forget to personalize the letter before printing অথবা to give Professor McGonalgall an পান্না signature. আপনি can also copy the image of the Hogwarts সীল and paste into a word document.

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

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

Then আপনি can copy and paste the সীল 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 }