I don't hesitate to go for broke with baby puppies - they haven't had enough time on the planet to become digestively accomodated to any diet, really.
One caution I would give you is that baby puppies are sometimes desperately hungry and unskilled at managing pieces of food. I am much more confidant feeding them either ground products (preferably whole ground meat/bone/organ products) or really large pieces that are challenging and cannot possibly cause choking.
You do want to know some stuff. Raw feeding can be done properly in a number of ways, and improperly in probably even more ways. If you have no experience with raw feeding, it might be wise to join a list or two (I am on RAW-lite on Yahoo, and we would LOVE to watch a Doberman puppy grow up!) and buy a decent book or two. You can do this now.
You also want to begin prowling now to locate resources for products, maybe network with other raw feeders in your area to discover where they shop (and if maybe you have access to a co-op). Having a dedicated dog freezer will make you life much easier - you can buy in bulk less expensively, take advantage of sales, etc. Having to shop all the time is inconvenient! In your waiting-for-puppy time, you can keep an eye on Craigslist and Freecycle for a freezer, if you don't have one.
Congrats on your impending addition, and congrats on deciding to feed what dogs really eat!