Answer:
I have no idea, but Dragonball Z is an awesome manga and.... WAIT!! I think I know some ideas on how to get good at DRAWING manga!! first, go to a store, get a manga, shonen jump magazine, or any stuff like that, and then try drawing characters from whatever manga you got. then you should try making your own characters.
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definitely hard but the important thing is you enjoy what you do...
if you don't do the things you like, the preassure will sure crush you...
just enjoy it with your heart...
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do you draw or sketch?
do you like story telling?
it's ironic for me but comic will bring the best of both as the other would be the escapegoat of the other.
meaning if you suck at writing, you can show the feelings of your character by drawing them and if you can't really express their feeling by drawing them, you can write a more convincing script. therefore both complimenting each other....