How far along is the company? What's your current status, do you need the money? How much do you believe in the product? What % of the workload is going to fall

How far along is the company? What's your current status, do you need the money? How much do you believe in the product? What % of the workload is going to fall on you, and how much do they need your skillset? How do their resources look (money, time, etc)? There's a lot of things you'll need to explain before being able to get a good response. i.e. If the product is from scratch and there are little resources, there's no reason you shouldn't get close to or even founders equity, but if they already have a product with traction it's a completely different story.