Text problems

I just got Photoshop CS, and I'm still getting the hang of it. I'm having a few problems when it comes to adding text. For example, I try to put in text in a random screencapped picture, and when I click the button to put in text, the size becomes supper small, even at 72 pt. So, I had no choice but to use 1200. 

Can anyone tell me why it does this? How to fix it? Because the text works fine on certain pictures. Does anyone face this problem? U_U 

Also, how do you put in borders on pictures and texts?

Thanks.