Hi,
If you are really excited for flarum but having difficulty while installing it. You can shoot me a message on thechiragaggarwal at outlook dot com I'm to install about 4-5 per day due to less time.
Don't hesitate. This is just my contribution to flarum. And yea! That's free
Shared server would also work but they should meet the requirement.
Plus, I would recommend fastcomet to host flarum in less price and easy flow.