This is always a fun topic and one of the most serious, if you ask me.
This is where you want to consult a lawyer once you've outlined your contract/proposal agreement. Each state is different and the laws are not always applicable.
Writing up these proposals is a way you can protect yourself, team , family and business. So, looking for and building a relationship with a lawyer is critical. And, there's all types of lawyers, too.
We have 1 for litigation, 1 for corporate and 1 for trademarks. It's an entire team that communicates with our CPS, too, so our **bleep** ARE COVERED! I see too many contractors working their **bleep** off, only to argue about getting paid , change orders or having to do work they NEVER agreed, too.
We have an entire folder of FREE Forms, Template and contacts for downloads in our mentoring business group for contractors. You can find it here, along with a FREE booklist.
https://www.skool.com/home-masters-mentoring/about