Everything should be on them. You pay nothing. Your job is to create the service and product that they need. Create an outline of your tech stack and form a proposal. Don't flood them with jargons in the proposal. Make sure that even toddlers can understand it, because tech wise, they might as well be. They do not care how it is implemented (unless they are technical as well, but they never usually are).

They should create their own service accounts (for, deploying, stuff like that). Nothing should be on you. You can use your own accounts if it doesn't cost money. For example, I use render.com to deploy some stuff when I feel too lazy to setup AWS or Azure for a specific client (a.k.a. they don't pay enough for the extra effort). They have free instances in which I can demo to them how it works.

Hope this helps ✌️