Startup - How? or Should I?

I have developed a CRM for a mid-size travel company. CRM started as a very simple solution for their tours but then it became very sophisticated software to run every aspect of their business (CRM covers their tours, clients, reservations and also accounting part of the business). Continuously updated with feature requests. Now, it has been heavily used for over a year now. I can easily say that the software is close to its mature level.

My questions are; - Should I go for a startup and make the software publicly available?

If I should go for the startup- -How to start? -Licensing? -Partnership? -Funding?

Thanks in advance for any recommendation.