I run a bootstrapped B2B SAAS (12+ years now) and I have seen it all, made all the mistakes possible and had enough wins over the years to keep going.

The first thing to understand is that there is no one size fits all. You have to start somewhere keep iterating. Ok you probably already knew that but wanted to preface anyway to set expectations.

Overall, You have to start with the WHO. Who is this product really for ? If your answer is generic or covers various horizontal segments, you are going to struggle a lot more. NO one builds a product that covers various horizontal segments on Day 1 and succeeds generally. You have to go really really niche and specific. The problem is that this scares new founders who think that if they don't think or aim big (translates to trying to sell to too many segments), they will fail or not make enough money to make it a real business. This is totally false thinking. Take it from a guy who has done it for 12+ years and still fails.

Once you have defined the "Who" (note that this may change with time but you have to start somewhere based on your best assumption as of now), you should have it written down very specifically. For example, don't say "I have a CRM". Instead say "I have a CRM that helps B2B SAAS founders in this specific way".

Also, 100 customers is too ambitious and unrealistic in early days. Start with getting first 5-10. Get them in first. Condition your mind that it is ok to have a really small set of customers who hopefully love your product. With that, you now have to go hunting also known as "outbound" in salesy terms. Sorry no magic wand here if you were expecting a different answer. You of course can do the usual like submitting to directories,writing blog posts etc and you must do all those as well on the side as everything adds up.But the most important thing is manually reaching out to prospective customers.

So now the question is: how do I find those prospective customers ? This will again depend on the "WHO". But more importantly, where do they typically hang out ? I don't mean necessarily in person (that of course helps a lot) but also online.

One tip is to look for customers in your niche already who may be using a competitor product. Websites like builtwith etc can give you a decent list of those customers (not 1005 accurate but they are reasonably accurate).

Bottomline is that you have to do manual outreach every day (minimum to 50 people if you can). Don't sell them the product. Start asking them for a conversation.

All the best. Happy to help if you have more questions.

Thanks that is great info. will see in this direction