Develop
Copyright protects original content. So when new software or code is created, it is protected by copyright just like book or painting.
As you build your business you may also build your team, with fulltime staff, independent contractors or new business partners. Thinking ahead means you can bring them on board and know who owns the IP you create.
It is rare for any software product to be entirely developed from scratch. Developers often make use of existing code and libraries, so be aware of what you can and can't do with this code.