ms access and ms excel !!??

hi!

I have data in ms excell files in different worrksheets!
I want to convert them to ms access so that i can centalize the data! the idea is to simplify the collection of data, calculations and categorize of data.

How do i go about, am not good in ms access!
Can I have you are idea a simle idea?
from how to create tables,form from thos excel sheet?
what to look into most?
how to make it to do calculations?
How and where to use querries?

Thanks!!