Not sure what kind of information you deal with but here is one approach to solving your problem.
First, you don’t need a hundred journeys or at least not until you get really grounded in the system.
Second, use the journeys you already have stored in your mind that you have known since childhood to keep them order.
You know the alphabet without any difficulty at all in recalling the order.
So; select your journeys on the basis of the alphabet.
A = the Acropolis mall
B = the beginning/entrance to the carnival you looked forward to when you were a kid.
C = the challenger space launch that blew up
and so on through the alphabet.
Remember that it is your naming system. You can call anything by any name that you want as long as it reminds you of the location. I can call it the Acropolis mall because there is a travel agency in the mall with a spectacular picture of the Acropolis on display every time I pass by it.
Ok; so now I have my journeys in order. The next step is connecting my journey to the subject matter. Next, pick an image of someone or something that connects to the subject matter being memorized. Again, it only has to make sense to me not anyone else. The Acropolis mall is swarming with thousands of army ants which is related to significant battles in history or demographic trends or epidemics or traffic management. It doesn’t make any difference to me if someone else does not see a connection between army ants and remembering the Python code used by a specific traffic light coordination sequence that I have to remember.
So I have decided to use the Edison theater for A because I never go to it because it is on first Avenue and there is no parking anywhere on first Avenue. Since I never go to it, what is important about the theater for me is that it is on first Avenue. It is a simple journey because I am unfamiliar with it so it doesn’t have a lot of memory clutter to distract me.
Even if I have never been to it once, I can get a picture of it showing the outside. It will have a set of standard features that I can label anything I want. It will have what I call four walls, a bottom and a top. It will have something I call a ticket booth and something I call an entrance and an exit. Four walls, floor and ceiling/roof plus ticket booth and two doors. Kim Kardashian sitting inside the ticket booth gives me ten stations.
I attach a journey to each station. To keep the journey in order I use a journey sequence I can’t possibly forget. One through ten. Archimedes jumps out of his bathtub screaming Eureka and runs naked with a machete through a a one through ten crowd of famous scientists associated with astronomy in some way. He confronts each of them and engages in a deadly argument. They sing formulae, facts, observations at each other until Archimedes kills them in frustration. Repeat the one through ten in different languages. The key is to keep it consistent. I use English, French, German, Russian and Lithuanian because that is the order that I learnt them in.
Now that is a possible ten stations with ten journeys attached, each one of which is repeated in four languages. That is four hundred locations for the letter A. That is thousands of locations for one alphabetized journey. Construct a different alphabetized journey for each topic.
Some people have difficulty with journeys because the journeys are too elaborate with lots of stations with details that must be faithfully remembered.
Check out Professor Metivier. He has a free magnetic memory introductory course of four lessons by email. For a few dollars you can buy his book if you like the approach. If you like his book you can take his detailed course for another few dollars. If you seriously get into it you can take his master class for quite a few dollars. His free email/youtube postings on an almost daily basis constitute an advanced course in mnemonics by themselves.
