How to prepare file of Business card for printing

Don't use jpeg for text. Jpeg compression is lossy and whilst very efficient at file sizes, does impact the image at each save. With a photograph it may be a couple of saves before it becomes noticeable. However it will be quickly noticed in the crisp edges of small text.

Do you have access to InDesign? It is a much better application for preparing cards for print and can still import any vector shapes from Illustrator and any photographic elements from Photoshop that you wish to use.

Dave

You don't write what filetype it is you downloaded as a template, but I would avoid the save as JPEG stage [because it compresses the file and is likely to damage the text] and I recommend you ask the printer whether they prefer PDF or maybe tiff files. 

I hope this helps
neil barstow, colourmanagement net :: adobe forum volunteer:: co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management

Save as Photoshop PDF to retain fonts and vectors for highest quality, presuming that you still have text layers intact.

Does the file contain bleed?

What colour mode and colour space is the file?

The print service provider should be able to work with a 2 page PDF or separate files, however it will depend on their file submission guidelines and if you can communicate your requirements to them.

Photoshop would not be my first choice for creating a business card.