You cannot draw but want to make a manga or anime?
Well why not try doing things the old fashioned way? By tracing. What tracing? That is horrible! Why would I trace someone elses work?
You don’t have to do that silly. You can trace using references you create. There are many programs you could use to setup a shot and then trace it.
You can make your own characters in 3d and then use them to trace.
Here is an example of creating your own characters.