Hi Rax,
The only thing you need to know about is application and its requirement, other things you can learn if you can't find you can reach here experts can help you out.<br />
As a fresher you are ready to blend in any concept and learn any concept, You are not alone in your company as well as here. ;-)<br />
So no issues, you can go ahead and start your design.
You can find bunch of results for Tips and good practices in database design.
Take a step and come here, don't ever ask here or to yourself, whether to take step or not.
Hope this helps you a bit.
Regards,
RK