Need help from Indie Developers

A bit of intro:

I started my career in ops in manufacturing, with time I have moved to tech (across various roles ops, marketing, product, project, analytics and eventually sales). I have sold SaaS, SaaS+Service, and was part of the team that closed reinsurance deals.

What I am making: I have created a bit of python programs for data analysis, Twitter bots, web scrapping, etc (it's on my website - https://talesofss.com/ ), but don't know how to make web apps.

I am here to learn: What do I have to learn to be able to create small online projects

1. Like if I want to create an online platform where people can share their excel sheets and the program does the analysis for them, and output is a few Excel files - know a few US orgs that could pay for this

2. Webp converter online (I created a Mac app, but don't know how to bring it online) - this is to make my life easier

3. Publish a database but only the first 100 is visible, post which users have to share their email IDs to view the rest - this can be used for user acquisition/monetization

I tried Java, css, html with ChatGPT but still don't know how to publish the results online

Currently doing a course on AWS EC2 but it's too confusing

Looking for someone to either help me build these or point me in the right direction :)