Your strength will most likely increase. I can usually lift about 5-10% more weight once I'm fully loaded on creatine. So a 100 lb max lift will jump up to about 105-110 lbs. I'll admit, thats not a huge jump, but its for real.
You'll also gain a few lbs, for me its about 5 lbs.
The only problem with creatine is its a one time deal. You get your extra 5-10 lbs of weight and strength, and then it stops. You don't keep getting gains from it. And when you stop, you lose the weight and somtimes the strength.
So I'm not sure if its really worth it or not.