What do you need for your own construction workshop?

You're talking about a "hobby workshop." A "construction workshop" in the sense is a workshop on/for a construction site.

What you need is a little geared to the planned projects, but whatever happens is a work bench with a screwstock, the most common hand tool for wood and metal processing, as well as storage/storage for tools and materials.

It is recommended to make the workbench, shelves and so what a French-Cleat tool wall and hangers themselves. Since you seem to have hardly any experience, these are very simple and at the same time useful entry projects to get familiar with the tool and gain experience.

https://youtu.be/SFrWBdb0OjU

In addition to the mentioned basic equipment, the first machine to be produced would be a table or column drilling machine, or as an absolute minimum a two-speed hand drilling machine and a drill stand.

For the French Cleats, a circular saw would also be recommended. For this purpose, it does not even have to be particularly good, mainly the saw blade can be angled to 45°. In doubt, one must also fix the stop if it is too bad or improvise a stable stop itself.

https://www.youtube.com/watch?v=EVmhvfWKU

But in perspective, one does not only create this for simple work and a completely usable TKS is a little more money and especially space. If there is not much of this at the beginning, the cleats could be produced, for example, with the milling cutter and a somewhat larger velvet milling cutter with bearing ball bearings made of roof louvers. Here, the angled region remains blunt at the bottom, which is even advantageous. The milling cutter is a very horny tool that is recognized in Germany, it is definitely very useful to own one. I would probably still be able to work before the stitching saw, which it can also partially replace for the need if it had to be.

Or you could go completely away from the cleats. I'm not a friend of mine, but it's possible to room something similar from quite normal shadows.

https://www.youtube.com/watch?v=_fVEmeoEJxw

A lathe and milling machine should only be purchased later if you have learned much more. They are extremely expensive, so you can quickly be tempted to turn a more worn-out bread that basically belongs directly to the garbage. At the same time, the work is not easy, the learning cuve is quite steep in places and you need some expensive accessories, otherwise things are pointless.

Topic steep learning curve, welding is still more difficult and complicated, yet you should at least get something like a simple, not too small inverter for electrode welding over a short or long time and work in a little.

https://youtu.be/zcq1LQq08lk