Technical support with Microsoft excel 2007

Hello,
I need some technical help with Microsoft excel 2007. I need to write few equations to set for a particular column along with summation, division and the format contains multiple time these application. Need someone to instruct me how to write different type of equations in excel or how to restate them in excels on process. As far as it works it is alright with me.
Kindly someone provide me with the necessary guidelines.
Jayson Mars
