Whichever you decide, you should succeed in. It will be hard work and all those things you most likely already know but I really encourage you to start writing.
Get a demo of at least 10,000 words out there on a hosting site, run it by the community and go forward from there. Also, being an artist as well puts you ahead of simple writers like me who can’t draw the paper bags we can’t get out of.
The people here are awesome and will help you with any questions on coding you might get but there are a couple of starting points to get you going.
1st - FairyGodfeather’s beginner thread is a great resource for all who are starting. I’ll try to find a link and edit it in in a sec. Here is the link: Master-List for Beginners.
2nd - the wiki put out for Choicescript is really good - even if it is lite on example code.
3rd - the subforum for code questions here is great to ask questions in. Lots of stuff can be found there with the search feature.
Great luck in the future.