Best way to sell first theme on Envato market?

Hello there,

i want to sell my first theme. Yey. :rofl:

So, can u tell me step by step how is best and correct way to sell and put first theme on envato market?
I have some questions about fill form on starting selling :

How to pick best Extended License? Why i need this?

Demo URL must be on my own site or can be example on Heroku?

Btw. Share with me your experience with good selling theme?
Have a nice day.

https://help.market.envato.com/hc/en-us/sections/200615794-ThemeForest-Requirements

Ill read, thanks @ki-themes