Don't bill hourly.
Incorporate.
Never reduce your rate; cut project scope instead.
Every project worth doing is worth writing a statement of work.
A good SOW includes acceptance criteria.
Don't expect to work on your own paper; clients will require you to sign their contracts.
Get a lawyer, have them review every contract you sign. (This is why there are MSAs and SOWs.)
The lawyer advises, they don't decide.
If a lawyer is too expensive, your rates are too low.
Also, your rates are too low.
Don't position yourself based on tech stacks. "Node.js consultant" is a crappy differentiator.
Don't set your rates based on your previous full-time salary. Your rate is barely even related to your salary.
Get health insurance.
Do not fuck around on taxes. You owe them quarterly.
Serious consultancies don't demand up-front payment. Do what you need to until you get serious, though.
Finally: you need a lawyer to evaluate that clause. It could be a boilerplate IP assignment, or it could be a blanket concession that your client can file a difficult-to-dismiss lawsuit against you any time for all time.
If this project isn't worth the $200 that will cost you, it's not worth doing at all.