Once you have mastered pike holds and elevated pike holds its time to put even more pressure on your wrists and shoulders.
But before you start doing wall walks I suggest you to do one step in between, a safer method just to make sure you are strong enough and get used to walking with your hands with this easier variation shown in the video below.
Once you feel confident with this move and perform it with ease, you are ready to try to do wall walks.
Since you are starting wall walks I suggest also learning how to bail out of that position in case you lose balance and fall over. Getting over the fear of falling.
Learning to bail early in your handstand journey is very important, it will get you prepared for handstand kickups later on. There is more ways to bail out of it, I will demonstrate one method in the video below.
Once you got confident in bailing out, you are ready for the wall walks.
By doing wall walks safely and with confidence its safe to say you have build solid overhead strength, the foundation for being upside down. And you shoud not be considered as complete beginner anymore.