https://www.youtube.com/channel/UCg.....fUsSlcr7A92-aA
David Peterson - guide of conlanging, creator of Dothraki
I fully reccommend you if you need some decent guidelines how to make up a stable language.


https://www.youtube.com/watch?v=sFWc0sBO62c&list=PLduA6tsl3gygfiWmGAhhHb4-HAqP6I63l
Artifexian is a channel dedicated to worldbuilding and Conlanging Series is been developped from time to time.
18.08.2016 - The last episode was about creating a script


Other links:

http://ipa.typeit.org/full/
http://conworkshop.com/

I am sorry I wasn't able to help directly but I haven't been feeling very productive, lately.

If anyone sees it, I'd be happy if they come up with an idea o: