Somehow, in every inquiry about renovating old buildings, someone always feels compelled to write that they wouldn’t tie themselves to something like that and would never ever do it and can only advise against it (based on 3-5 lines of description without pictures) ... usually without expertise or personal experience beyond their own role as a builder of new construction.
A little house from the 1950s is usually quite simple, and modernization/renovation is no rocket science. The OP is even lucky that apparently much is still in the [Originalzustand] and nothing has been worsened by misguided improvements.
There is no list or project plans here or that I know of. It’s generally not possible because the scope of renovations and the necessary sequence are not always the same. However, it always makes sense:
First tear everything out, then everything that creates dirt, from top to bottom, then put the windows in and finish with the floors/screed.
If you want to renew water/sewage/heating/electrics, depending on condition and pipe routing, it also makes sense to renew the screed at the same time. When done as dry screed, you even get insulation. Tiled areas can be done completely without conventional screed and you can directly glue and tile cement-coated, fiberglass mesh insulation boards ([Bauplatten], [WEDIplatten], [Jackoplatten]). It insulates, is cheap, can be done yourself, and is quick. For proper insulation + screed, there is usually no space downward in these houses.
Important to clarify for renovations in the cold season is how to keep the place warm when the heating is off and how to get construction moisture out of the rooms. It’s very helpful to insulate the roof or attic as quickly as possible.
Whether the 100k is enough depends on the size of the house, the actual planned work, and your own contribution. For a similar scope of work on 140m² (windows, heating completely, electrics completely, floors and 70m² screed, plaster repairs and new fine plaster, paint, one full bathroom, excavate basement, insulate, seal, small masonry work, new interior doors, attic insulation, ceiling insulation in the basement where possible) we paid about 60k€. The only craftsmen we had were the plumber for water/sewage pipes and the entire heating system including pipes (20k€), the window installers (15k€ including removal/installation), and the electrician for equipping and connection of the fuse box (2.5k€ including material). The rest was own work.
We took about 5 months with two people (my father and me), always Saturdays/Sundays + 4 weeks vacation. It was fun, but after that, I was done. After moving in, there were still some finishing jobs, and after now 1.5 years with two small children, even the new terrace is finished and the garden is in shape... but there is always something to do.