green newbie asks: print mailing labels from an Excel docum

A little backround. I know NOTHING about Excel. I'm running Windows XP and I think it was bundled with Excel XP (?). My Dell is only about 8 months old. My objective is to print mailing labels (I guess, using Mail Merge Wizard) BUT, I need to extract some of the other info in the [worksheet]. I recieve e-mails with attachments in Excel.More specifically, when I open the attachment and Excel opens, there are cells (?) that I want to delete (i.e. case #'s, etc...) before I print the labels.
What steps I do know:
1) save & name the Excel document (or whatever you call it).
2) close Excel and my e-mail, and open up Word.
3) Tools>Letters & Mailings>Mail Merge Wizard.
4) 'Labels' radio button.
5)click on 'Next: Starting Document'.
That's about as far as I get.
The two things I will say is I know what I don't know about Excel and I think when I become more proficient at it, it will be an awesome tool for my business. Also, I've done what I can to follow certain newsgroup protocols and I do hope I haven't ticked anybody off. I really need this help for my business. Thanks a million in advance and I do hope someone responds.