Create letter out of Excel Files and Save as PDF

HI Experts,

I need some help, I am trying to achive the following:

1 Read Excel File and store certain columns as Variables.
2 for each of the records on the excel file open a letter use them to replace certains fields within the letter (Fields within <>)
3 Save letter as PDF
4 Finally create a record on an excel file with certain fields used on the letter

Any Sample that I could follow?

Thanks for alll advices.