Welcome to SRP. Regardless of which one you choose to start with send it to one of SRP's members that have honed a lot of razors for a professional edge, it will make a world of difference in your learning curve. I suggest you put the two with missing parts of the blades (chips away for now and focus on one of the good blades. A rounded end would be a wise choice. Good luck and be sure to read through the beginner's forum and the WIKI section for beginners. Take your time and start with just your sideburns. When you get comfortable holding and maneuvering the razor move on to other areas starting with the next easiest to shave.