Need help understanding importing xls feature

Hi, I need to import my leads from an existing xls file that I am currently using to track customers. I've read the online help and have a bit of gray area.

There's a table that states the mandatory fields, but I'm not sure how this works, is there an exact picture example what this looks like in excel? Do I have to input the fields in the exact order as shown? Why are there multiple columns in the table with multiple mandatory fields?

I'm hoping I can just plug the field wherever my column is.

Would appreciate some guidance.

thanks