Not sure what "topic" my question will fall under but my question is: What do I need to do to legalize a non-profit organization I created last year?

There are no "non profit law firms." If you need legal advice with the formation of a non-profit entity, check with a local bar association for the name of a firm or lawyer who will advise you on a pro bono publico basis. Most non-profits regularize their status by raising sufficient funds from donors to pay for the services of a qualified attorney and also to pay for such items as the fee charged by the IRS for determining your tax exemption. It is not reasonable or practical to think that you will be able to do these things without cash.