is it in term of manual testing or automation testing?

If it is manual testing then u have to follow the steps one 
by one in the test case then u have to check the expected 
results with actual result.

Follow the steps given in excelsheet and check the expected 
result and update the actual result in the excel sheet.

Follow the test cases written in the excel sheet and 
provide the required test data and check the 
functionality . observe the actual result and write that 
actual result in that excel sheet  . If Expected = actual 
then set the result as pass otherwise set the result as 
fail.

if it is in manual testing we have to follow the steps
written in excel sheet if we r in automation we should write
test data in another excel sheet and link with tool by using
parameterization

Test cases basically based on test coindition,expect 
result,then actual result ,then pass or fail.
write the condition you found form your test scenarios,
then write your expect result in the same row.
when you get the design version then go for actual test ,
if the actual resrlt==your expect result then it pass,or 
fail.
the test case & test scinarios written through fdd.

If its Manual testing then you have to follow step by 
step .If its automation then you have to parameterize the 
data using any automation tool like Qtp or winrunner