VS 2010 Visual Basic .NET Decrypting File

Hello !

For a long time I am trying to decrypt one file format, I was researching and finnaly found some basic structure of it. I am quite new to binary files and don't know how to write a proper decryptor if you have a file format description.
For example:

HEADER:
14 bytes, must contain SREOBJ
model1
model2
model3
...
What shall I do now with that 14 bytes ? How can I can convert them to string ...
The main thing of that file at the moment for me is to convert it to readable file.

My code at the moment is quite simple:

Public Sub open_vob_file(ByVal path As String)
Dim input As FileStream = File.Open(path, FileMode.Open)
If (Not input Is Nothing) Then
Dim reader As New BinaryReader(input)
If (Not reader Is Nothing) Then
Dim test As String = reader.ReadString
RichTextBox1.Text = test

End If
End If
End Sub

I was also researching about HEX Editors, some reverse Engineering topics, but din't find quite a lot of information, probably because it is not so simple, maybe there are simmilar open source projects ?

Thank you.