As others have said, there isn't any way to shape shift outside of maybe the astral. You might consider why you want to turn into a wolf, what draws you to them, and see if you can incorporate some of that into your magic practices.
As to summoning a familiar. Think on why you want one. Not everyone has or needs one and, while they can be helpful, in my experience it's fairly limited what they can do. Also, remember that this is a spirit, not an actual living animal. You won't do a ritual and have an animal show up at your house waiting to help you. That all aside, try meditating on what you want to accomplish and what you think you'll need help with, if something shows up make sure you keep in mind what's in your best interests. Failing anything showing up, you could try building a thought form to serve as a familiar.