what pre-flop situations should you call/fold ???

Hey people, brand new to this forum. Looks great! Here is my question:

If the pot is at 100,i have a 3d/6h, and i have to call a raise of 25 to see the flop. should I call so i can see the flop or should i just fold? what if the pot is at 1000 and i have to call a bet of 100 to see the flop? is there ever a time where you should call with cards like that or should you always fold? I have read that you should only call with "premium starting hands" (AA,AK,AJ, KK,QQ, JJ etc....) no matter what the size of the bet/pot is. Is this true? thanks alot everyone. all your answers are greatly appreciated.

very sorry about the multiple posts everyone. my browser wasnt loading so i pressed submit a couple times not realizing it was actually submitted! :S