People, I´m a copywriter for around 6+ years. I´ve built what we can call MVP up on the link in 3 hours and now I am creating the software. The software needs storage space with each user having his own, active tasks, language selection and scheduler for an easy first version. I want it on the web after somebody buys service.

Question on hand: I know how to code some basic front-end and learning back-end but I want to use no-code tools since they seem easier. Can I use Bildr, Webflow or Bubble with Airtable and if so, is it going to work correctly?

No, it will be a joke, limited, slow, sub-par experience, expensive at scale, not attractive for users ... It's a fast way to trash your idea

Altough I am thinking Ruby would be both quick and easier to release

Ruby is good as well, but if you have zero knowledge about it and plan to start from scratch... Maybe not, it's harder to find dev working on it compared to other stacks (python, JavaScript, Go, ... Even C# is more popular)

Okay, thank you a lot and since I am yet a solo-founder, do you think you could provide me with useful links that could help me build this because I am a rather untalented creature. :D

It's a collection of 100 implementation of the same project but in different languages. This might help you to choose your preferred stack and see a real world example on how to use them and learn