Wheeeeee!

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?
Personally, I'd fold. You have to hit that flop really hard, and if you hit it that hard you're probably not getting paid off. Maybe on the rare occasion you make the baby straight.

what if the pot is at 1000 and i have to call a bet of 100 to see the flop?
I'm seeing a flop this time, but I'm not blowing money on a one-pair hand.

is there ever a time where you should call with cards like that or should you always fold?
There's a few times. When you feel like you can see a really cheap showdown if you hit a pair. Where you feel like your implied odds are huge if you hit a hand. Where you feel like you can fold your opponent after the flop.

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?
No. You should be raising (most of) those hands and often folding some of them (AJ). You can get away with playing a lot of other hands in unraised multi-way pots, like suited connectors and small pairs. But generally these don't play well in raised pots.