Just start right now.
Open up word, Google docs or fucknot, pencil on paper and write. Do it now, like right after you read this post. Write and research until you're done, no distractions. Close all social media, turn off your phone, even block sites that might distract you. If you feel shitty about it, just power through. Finish unfinished work. If stuff doesn't work out, put it aside and take a walk in the suburbs or something and come back to it, don't abuse that because you're lazy or sad about it. Don't just see the start and endpoint, there's an entire mountain in between you'll have to climb.
If you do that, you've done something over 99% of people tried and failed, hell, a good chunk of them have never have even written or drawn their idea down.
This applies to fucking anything in life, art, writing, sports, your own cartoon or comic. Just start that shit and keep at it. Also practice, learn and practice what you've learned. All this worked wonders for me, it's simple, but magical shit.