For CS5 and later, the easy way to insure that your video and your project match
See 2nd post for picture of NEW ITEM process http://forums.adobe.com/thread/872666
Also, since you are new... some reading
A "crash course" http://forums.adobe.com/thread/761834
A Video Primer for Premiere http://forums.adobe.com/thread/498251
Premiere Tutorial http://forums.adobe.com/thread/424009
Premiere Pro Wiki http://premierepro.wikia.com/wiki/Main_Page
Tutorial HD to SD w/CS4 http://bellunevideo.com/tutorials/CS4_HD2SD/CS4_HD2SD.html
Color correction http://forums.adobe.com/thread/892861
After Effects Tutorials http://www.videocopilot.net/
Surround Sound http://forums.adobe.com/thread/517372
Photo Scaling for Video http://forums.adobe.com/thread/450798
-Too Large May = Crash http://forums.adobe.com/thread/879967
-And another crash report http://forums.adobe.com/thread/973935
Encore Tutorial http://www.precomposed.com/blog/2009/05/encore-tutorial/
And more Encore http://library.creativecow.net/articles/devis_andrew/
Regions and NTSC vs PAL http://forums.adobe.com/thread/951042
If your clip is zoomed in in the Program Monitor (the one one the right) it means your sequence settings do not match your footage.
If you do not know which setting to choose to set up a sequence
drag a clip into the New Item button. See screendump.
It will create a sequence that matches your footage.
There is also a possibility you set your Monitor to 100% instead of fit.
IF YOUR KNOW HOW TO FIX, PLEASE HELP!
1. Open Premiere Pro
2. Hit F1
3. Read the instructions on how to use the program. Go from beginning to end, don't skip around. Try each new thing as you learn it. Look up any words you don't understand.