What's the best way for me to do this. Here's what I have been doing.

I have an .ods (OpenOffice Document) that's a spreadsheet we use to create an invoice for a potential customer. I have been creating it on my desktop and saving it as a PDF and emailing it to the client.

What do you recommend I do to simply and make more professional? As of yet I have not tried "Zoho Invoice", because I already have an invoice. I don't want to have to learn another thing to send invoices. Is that possible?