you will cover that later when your a little older,
you will then know how to make a hull,
its not really easy and the fact that you have made a nice shaped hull is already brilliant
try different techniques and if you want go through some videos are ask your tech-design teacher at school about how to make one, they will surely teach you some of their techniques
![Wink ;)](http://forum.shipsim.com/Smileys/default/wink.gif)
because here on internet there arent many good videos or tutorials about how to make a hull so the closest you could ask first is your own design teacher (a tech one) if he/she doesnt know then ask them how to make a nice curve or round shapes, that might help you on making a hull