Hi,
Although I've helped many SaaS startups, your question is a bit too general to give an educated answer, because it really depends on the type of service you are providing, the niche' you're targeting, the clientele, country, etc. For example, launching a SaaS product for B2B isn't the same as launching for a B2C product. A product for younger consumers wouldn't b launched the same as a product for older ones.
I've successfully helped over 350 entrepreneurs, startups and businesses, and I would be happy to help you. After scheduling a call, please send me some background information so that I can prepare in advance - thus giving you maximum value for your money. Take a look at the great reviews I’ve received: https://clarity.fm/assafben-david