How to write the notice that the company stipulates that internal personnel must play cornet?

Notice on the company's internal personnel must play cornet (title 2 is in the middle)

Employee: (colon is full width)

The reason (the reason for opening the cornet, write it yourself here. For example: xxx, because xxx)+ Now the company stipulates that internal personnel must play cornet. The relevant matters are hereby notified as follows:

First, the opening mode and cost

Second, the deadline for bid opening

Third, where to report the number after opening?

Because I am a student, I just learned to write official documents, and I don't know much about it. There may be omissions. You should think about what else must be mentioned. )

I hereby inform you.

(The text has 28 words per line and 22 lines per page. The text is Song Like No.3, and each paragraph should be blank, including the previous "123", but my answer is crooked when it is uploaded. )

XXXXX (your company's name and seal, here is a question that Baidu knows, I can't align the text ...)

X year x month x day