You need a lawyer experience in creating permissible lotteries. Your question makes it appear you have never been in business before. Setting up a not for profit makes no sense. This is a highly scrutinized and technical area of law.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
You should consult a business attorney.
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An interesting concept, but many hurdles to clear. In addition, if you are able to be the pioneer in clearing those hurdles you may wish to protect your franchise since the others following will not have to endure the costs that you did. So my suggestion is to contact an attorney willing to assist you. Good luck.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.