I'm so happy for you that you are going to have a pup soon -- congratulations!
My boys are both pad and outdoor trained. No problems. Focus on the pad training, and the outdoor part will come naturally. Be sure to praise, praise, praise for correct potties -- pad or outdoors.
Maximo took a little while to figure out that it was okay to potty outside on our walks or outings. He is still excellent about discerning when and where it is okay to potty. For instance, he know stores and garden centers are not places to do his business.