My advice:
Don't build the SaaS product first. Build the customer list. That means going out and talking to folks who you think might pay you money to solve their problem.
It is far far too easy to get wrapped up in building something (building is fun!) that never gets used because you didn't talk to potential customers.
Patio11 has a great article on this process here: https://training.kalzumeus.com/newsletters/archive/validatin...
Also, don't be afraid of providing some granularity in plans and be flexible about letting customers adjust them as they go. Underutilized plans are good for you in the short term, but probably not a good way to retain users if another service comes along to offer them what you won't.
That's just my two cents as someone who is frequently frustrated by enterprise cloud services.
If you don't feel comfortable talking, consider partnering with somebody who does.
Remember this has to be a terrible terrible problem they are so desperate to solve that they would use a product made by some random guy.
If you think about it though you probably have problems in your own life that are so annoying if someone solved it you wouldn't care who made it.
Ads are a way to validate ideas like this. Internet forums are a good place to look. Reddit. Discord channels. Local meetups. Depends a lot on the problem space you're working on. Trying to figure out where your users hangout (online or in meatspace) can be a first step.
Start by talking to them. Once you have customers and revenues it's relatively easy to talk with VCs and take things to the next level.
If you don't know anyone in your target customer group, you need to take a step back and figure out how to make those connections and understand their needs before moving forward. The odds of creating something useful to users you don't deeply understand are pretty low.
If you haven't talked with customers or users, you don't know whether you have a product or some code and a way to run it. The difference is that a product is something that people will pay YOU for.
As for whether the internet can help you build a successful business, what kind of help are you looking for?
Do your customers use the internet to find products like yours?
If the product truly is killer, expect to get cloned.
You really need to be connected somehow or you are boned.
It would be easier with a cofounder though.