As Vidi says, you need a plan.
If you are going to create G2 characters then what kind of characters? Ancient Roman, Monsters, Military, Everyday, Business, Family, Kids ...?
Are you going to create a suite of characters that "go" together (i.e. the same style) or what? Whats your plan?
The Marketplace has a "Top Paid" category that you can look at that shows what has been selling recently.
You can also look in the G2 character category to see what characters you think are missing or just do what you want to do.
If you are doing props then take a look at what Garry Pye did with his.
He created a "set" of props that worked together or that even create a scene.
What's your plan?
It's hard to say what will sell in the Marketplace so just make a plan for what you want to do and if it strikes a chord with others then it will sell.
See my CTA Tutorials on the YouTube channel CTAStepByStep
Check out EZColors for CTA. The easy way to change Render Styled (RS) colors.