How to manage the code and structure of template as a themeForest seller beginner ?

I am beginner here !
I am very interested to sell my template .I started write html code 3 years ago .Although I don’t have experienced in freelancing .So if I sell my one page (home page) design on themeForest ,
how should I manage my folder structure and which things I need to avoid ? Kindly suggest me !!!

Make a hierarchy of separate folder. e.g

css folder
js folder e.t.c
except html folder

Your code is well document with table of content preferred.

You can grab free July themeforest item and can see all things u required.