I do not know the requirements of your region, but where I am a crisis line like this requires licensed professionals if any counseling is to be done. Setting up a non-profit is expensive, tax-complicated, and requires a set space which requires rent, utilities, insurance at the least (if renting, not buying).
Public places for as touchy a subject as rape (for males or females) is too public for a subject like that. Victims of rape are vulnerable and if you decide "well, let's have our meetings in a coffee shop or library" that means nothing is confidential and they are not allowed a space to be able to speak freely and begin healing. Rape is a subject you truly need a static, private, safe space to discuss.
Furthermore, if this is a support group, you do not need to have a non-profit status. It is a volunteer thing until it gets big enough that it might need structure (like AA, NA, AlAnon, SA, etc.). Those groups did not start out non-profit or as paid positions. If this is a startup non-profit that you hope will give you a job, then it needs to follow guidelines required of all non-profits in your area, and you may be able to get a business loan to start it up. (But then again, you will need a trained, professional staff that you will need to pay and they will need to meet their state guidelines on liability, ethics, and licensure to practice.)
I have worked in such a non-profit that covered not only victims of rape but spousal abuse, child abuse, addiction, depression, problems faced by former felons, etc. and we had a volunteer board of directors that managed at the top level (required by the state statute), a director that managed day to day operations, a bookkeeper, a grant writer, a marketer, an administrative assistant (me), a receptionist, 3 full time licensed counselors, and a staff of part time/contract counselors that worked on call. All our money came from the attached for-profit employee assistance program that contracted to local businesses for counseling services. It paid for both that program and the non-profit charitable organization that handled the abuse and addiction side. The place was a staple in the same place, with a static, private telephone number since the 1980s that people could come to and know they would be taken care of, but the original owner used a lot of his connections on Madison Avenue from his previous job as a stockbroker and in Hollywood to even get the place off the ground.