Looking to start my own sideproject

Hello Indiehackers,

I've been a member here for some time now watching people acheiving their goals. Its been interesting and inspiring to see how people have been able to fulfill their ideas into actual products.

My main reason for joining Indiehackers was on the hope that at some point by reading enough about other peoples experiences I may be able to take this step myself. As a software developer I've always wanted to build my own web app. At some point start my own company with it and then of course become a millionaire ;) I've had a few good ideas but was blocked from taking action by the following feelings:

1.Afraid of taking time to implement something which doesnt turn out very good
2.Not being very great at UI and UX. Sometimes I have an idea but when I try to implement it I get tangled up in the UX details
3.Feeling like I don't have enough time
4.Not sure how to get people using the product when I launch it
5. No idea at which stage I should think about pricing and how to implement it. I do want to monetise my app so at least it can cover whatever infrastructural costs there are. The ideal case would be if I could actually make profit from it
6. What legal aspects do I need to think of? This will be a side project and I won't be operating under a company. For example when do I need to think about GDPR and user contact information?

Finally, I took the initiative last month to use the Twilio Hackathon to get me started on one of my ideas. You can see my post about it here https://dev.to/mia01/event-a-task-and-event-management-app-for-family-and-friends-8j7

Basically it is an event and task sharing app. My vision is that it will allow people to manage their events and tasks and share them with their loved ones. Its more for social purposes than management.

I'm determined to see this through because I have really enjoyed working on the idea and feel it would actually be helpful to some people. But although I've managed to achieve a working prototype I'm not sure what the next step should be.
In addition to the points above I now feel blocked by these things as well:

7.I've implemented this as a webapp but this would work better as a mobile app. Unfortunately I'm not a mobile app developer. What should I do in this case? And how do I protect my interests if I partner up with someone?

8.Again the UI is still an issue and I'm not happy with the feel of it

9. How do I prioritise my ideas. For example I've had an idea for another app. Which one do I go with?

Thats a long list of things holding me back but I'm determined this time to overcome each one of them. I just need some guidance and advice to help me along the way alittle.

Thank you to anyone who responds with any advice.

If you could also perhaps leave some feedback about what you think about my app idea and if its something you'd be interested in using I would be really interested to hear from you.