ppi dictates how large the print will be. I'd print from Photoshop if you have it, as the document size handling is better. First step is to resize the image to exactly the size you want. If you want A4, then use image/Image size and set 29.7cm x 21cm @ 300ppi.
That will then print exactly the right size.... then just set Photoshop's print dialogue as I showed in post #35.
Do you have photoshop?
It sounds to me like jumping right in and spending a few hundred dollars on media profiling may be a bit too much for you right now. Get used to the idea of sizing and preparing images for print first, and using the off the shelf profiles available for your printer and paper/ink.
This may help