I am trying to conduct business with a company located in Japan. I am trying
to buy a kimono to complete a set for someone dear to me...(who may or may not
be on the site so I am keeping this part intentionally vague.)

Anyway on to what I am asking...

For years, I have been opening blind inquiries with "Sir or Madam:"

While お早うござします is fine for a friendly meeting or a second letter somehow this
seems like it might be a bit of a put-off for an initial inquiry.

Would it be better to use 皆さん or 御中 皆さん？

Second: Is it preferable to use 私 or 僕 when addressing oneself in business
correspondence?

皆さんにありがとうございます
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business-japanese
Dear sir or madame.... Japanese Mail Etiquette
おはようございます is fine.

Do you think 皆さん and 御中 are the same? They are entirely different. 御中 is an
honorific that's added to a company name with their address on an envelope. If
you use 皆さん, みなさま is better instead in letters or so. みなさん is fine in
conversation.

You should use 私 in public.
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answer
The below would be formal way to address somebody serving you. Company name
followed by contact person (for lack of a better English term, if somebody has
one please let me know)

> Company Name  
>  ご担当者様{ごたんとうしゃさま}
>
> お世話になっております。NAMEと申します
>
> blah blah, your request
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answer