Hey there... Well, I was told that taking them out before all of their shots was fine. As long as you limit it to a small area of yard/grass outside that you know other dogs are not frequenting.
Another thing is... I think 11 wks might be too young to try and outside train... but, Im not the expert. But, it seems they have to "use it" pretty consistantly at that age... So I would think that unless your home full time to be able to let her out, you might want to keep her pad trained for now. Not to mention, going potty outside comes fairly natural for dogs. I never offically "trained" Meka to go outside (we do ppads), but if we are outside on a walk or something, she'll do her business just fine.
To avoid smells witht he ppads... I usually change Meka's twice a day... In the am and in the pm... I also, clean the area underneath every time and that really helps to keep away odor... Hope this helps