Advice
To save me writing too much, a lot of this is going to be links to existing policies and guidelines - there is plenty of advice available, in fact a confusing amount, so pointers may be helpful. The guide to writing Your First Article and the Business' FAQ are particularly useful.

Wikipedia frowns on writing about your own organisation because of worries that someone with a conflict of interest will not be able to write from the Neutral Point of View which is one of our three key content policies. (The others are Verifiability and No Original Research). However, the anonymity of account names means it can't be prohibited, and it may be better to have a declared interest than somone pushing a case anonymously.

It should be possible for you to write an article about your organisation that won't get deleted, if you are careful. The first essential is to avoid any hint of promotion - be drily factual, as though you were unconnected with the organisation and had no interest in it, but were documenting it for completeness. See the guideline on peacock terms.

The next point is likely to be the problem if your organisation is new - notability, which is the Wikipedia term for "of enough general interest for an encyclopedia article". See the guidelines on Notability and Notability (organisations and companies). What you have to do is find references from reliable sources which are independent of you. Your own web-site etc are not considered independent. Has there been comment on your organisation, e.g. in the trade press? It may be that you will have to wait until you are more established and can cite independent references.

I wrote the above off-line: now that I come to post it, I see you have run into another problem - copyright. That's more of a problem than you might think, because everything in WP must released under the "GFDL" which says that anyone may do anything with it including rework it for commercial use - so just saying "I agree to this being put in" is not enough. The notice above tells you what you can do, but for the reasons in my third para above it is very likely that your mission statement will not be in suitable terms for Wikipedia, so the solution to the copyright problem may well be to rewrite it. That leads me to a last warning: an important difference between Wikipedia and a business directory is that you will not own your article - see WP:OWN - other people can and will edit it. See the warning at the bottom of the page you use to edit: "If you don't want your writing to be edited mercilessly or redistributed for profit by others, do not submit it."

Regards,