Learning 4x5 photography is no more difficult than many other activities we do daily. however, there are some discouraging pitfalls, and a well chosen first lens will help avoid some of them. A first lens really should be new or in very close to new condition. A used lens should be modern enough to come mounted in its original Copal shutter. Copal shutters are the industry standard for reliability. As a beginner, you will have enough on your mind without having to worry about shutter trouble. If not an ideal lens, very few of today's lenses will not be at least good lenses. A well chosen lens will be part of your longterm gear. In general, the quality of the major manufacturers is all quite high. I would be leary of purchasing a lens which is missing a cap. Careful photographers are very fastidious about keeping caps on their lenses. Purchasing a spare set of caps to be carried with the camera is a very cheap insurance against lens damage. I began 4x5 in 1981 with a Schneider Symmar S 210 lens. It is still my most used lens. I recommend the 210 as the first lens. I have also seen very convincing arguments for the 180. I think either would be an excellent lens for learning 4x5. I recommend choosing a lens with f5.6 maximum opening. The extra brightness will help in becoming accostumed to the groundglass. The image magnification on the groundglass is larger than wider lenses, making focusing much easier. These lenses all have generous image circles allowing plenty of movements with no problems. These lenses are not exorbitantly priced new, and there are a plethora of very good used lenses available in this length. You will not outgrow this lens. Look at the work of master photographers like John Sexton. Many of his images are made with a 210. The 210 requires neither bag bellows nor really long bellows. It is a very versatile lens. My last thought is to begin with only one lens. There is a learning curve with 4x5. Simplification will help. Put all thoughts of more lenses, filters, etc out of your mind. Learn to use your camera and one lens very intently. The season will soon arrive for extra lenses and filters. The skill earned during this one lens apprenticeship will stand by you well.