i have an ipod touch 3 gen. should i sell it cause ima get the iphone 4?

Just sell the ipod touch, not unless you need that much space for your music/apps.

Well are you left handed? Make sure you buy a case for your iphone before anything...I'm guessing.
Well Would there really be a point to keeping your ipod? but then again If you keep it you'll always have a back up ipod for when your iphone dies out. Then if its an emergency and your iphone is dead you could just go to the nearest mcdonalds (and those are everywhere !!! xD) and use the wifi to contact someone. Like log on fb and tell people your emergency so that they can help you out. A simple "Help" should get someones attention.
You should keep the itouch.

If i were you i would wait until the summer if you can because apple is coming out with an ipod 5.