I am sure the Pale Ale is great, and you know enough to make your own great beer. That's a lot more than most people...
I did one Lager so far, a Classic American Pilsner, and it turned out really good and won a blue ribbon. Other than that I am going off of books BUT, you don't
need a protein rest for a lager. That said it can help break down the proteins that could make the beer hazy. I did NOT do one with my Pils and it was crystal clear at 45 - 50f HOWEVER, now that I won

I can say that when it was really cold it was hazy. A protein rest AND a 90-minute boil would probably solve this issue. The 90-minute boil will REALLY help, and I have the TBN Forum to thank for that pointer.
Also, if it is a German Lager and you want to be authentic you may want to do a decoction, which will add a nice malty taste to the beer that you can't get from specialty grains alone.
REMEMBER, you do not need to do ANY of this. If it is your first all-grain lager you can stick with one-step and it will be fine. In fact, it will be the best Lager you ever had. I guarantee it. after you bask in the glow of your first Lager you can start to fuck around with Protein Mashes and Decoctions..
Rob