Protein Questions

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I've been thinking about starting a Protein shake lately as I have heard it will help with weight loss. MFP puts my daily protein goal at 45, however I usually average around 65 simply because I eat a lot of egg whites, chicken and beef. The large majority of my protein intake usually happens around breakfast time, on an average day.

My questions are: would a shake help me in my weight loss? Could I take in too much protein? Obviously I'd enjoy a shake in lue of eating breakfast unless I needed something more to eat, but should I add another later in the day in addition to my regular meals? What suggestions could people make for me as to brands or what I should look for in one?

I should also mention that while my daily life is rather sedentary I do try to get at least 5 2-mile walks a week and have been working on some strength exercises at home ie: squats, sit ups, weight lifting type stuff. So clearly I don't mind helping muscle build up either. :-)

Thank you!!!!