boagz57
can you just put up a statement online of how to use your license and then anyone can use your license and be protected according to it's stated rules?
Yes, that is exactly what you need to do.
Be aware that you cannot put arbitrary text and hope it will hold up in the court. If its in violation with other laws (which may be very different in different countries) or is just pure nonsense ("author can use this software only if she/he does not drink milk") - nobody will care about your license. That is why you typically want a lawyer to create and/or check your license.
That said, if all you want is to have open-source software, usually you just pick one of existing licenses that fit your use case. Here are page that helps you to do that:
https://choosealicense.com/