morning sting.......as you didn't specify what type of border you want to place around you pics i will assume a simple white edge will do......since you said you are new to cs2 suite i will also assume you are not as skilled as you would like to be......so for simplicity,........start bt making sure the color in your background/foreground box on the toolbar to the left is white or 'whatever' color you want your border to be...........to place a simple white border around your card.....when all processing is finished simply go into >image >canvas size....tick the relative box........change inches to pixels....(I normally use a setting of 4, but vary from time to time).......hit o.k. and Shazaam ! you have a simple white border........here is a link that should provide you with some info , chk under tutorials.....
http://www.photoshopuser.com..........(attached is image with sample of border created this way........if you are looking for something more sophisticated view thru the tutorials and i am sure you will find it......too, as mentioned illustrator does awesome work, but again i think you indicated that you are new to photoshop so illustrator may be out of the question.......good luck, and if you need further info, feel free to contact me.....by the way, you may also want to look into how to create an action as you can set up the process so that you simply click to apply it as opossed to repeating the steps a hundred times......g.l. unfortuneately the border is white and doesn't show so i will change the color .....