Set up the label as a template template under 'letters & mailings' and point it towards the excel spreadsheet as a database via a 'mail-merge'.

Within the label, create each line as a 'field' from the column headers within the spreadsheet. You can put these on each line as you would normally see on an envelope as long as you set it up that way.

If this is too simplistic I apologise. If you need more step by step instructions, please PM me. I'm sure there are very few other Catters who are interested....

If this is sufficient, good luck!!