Cartoon figure drawing is very popular.
But most enthusiasts get it wrong because of lack of proper training and guidance.
One thing you should keep in mind: it's all about your skill of observation.
If have good skill of observation your work will be easy.
But if you are not endowed with that skill you can develop that skill with some training.
Cartoon figure drawing is not really different from realistic figure drawing.
So you should be observing people around you.
You should be paying special attention to the proportions of various parts of human body.
Getting a good book on human anatomy will help you in your work.
But do not be afraid, you do not need to study anatomy intensively like a medical student.
Your goal will be studying anatomy from an artist's perspective.
Apart from studying the structure of the body you will require to study the emotions of people around you.
Concentrate especially how eye, eyebrows, lips, chin etc are participating in expressing the emotion.
Plus study body language of people: things like how a happy man carries himself and how that is different from a sad person.
In addition to that study garments and shoes etc.
This is essential as most of the time your character will be more than 80% covered by elements of his clothing.
True while drawing hands you will have certain freedom to reduce complexity: like many artists draw hand with three fingers even many popular cartoons are with no fingers, remember power puff girls: you should also spend some time observing and drawing human hands.
Keep observing people and practicing your art soon you will be a top cartoon maker with great skills.