Most of these 50 tips are easy enough to find. Just hit
when you're next to one to collect it. The hardest ones to find are in a secret area. To access it, enter the well in the castle courtyard as shown below. There are 3 or 4 down there as well as a secret entrance to a different Team Dakota level. WARNING: DO NOT ENTER THAT "BRAINS" LEVEL WITHOUT COLLECTING ALL 50 TIPS FIRST OTHERWISE YOU WILL HAVE TO START YOUR COLLECTION OVER AGAIN.
If you're still having trouble finding any please send me a PM or Xbox Live message and I'll try to help. I may upload a video with all of them at some point as well if enough people are having problems with it.