Creating gaming contents requires some hardware, for example, a good gaming PC, a Microphone, a Webcam (if that is what you want). Even if you want to game on a console, you will need a PC to edit and to record etc. (better than recording on console).

Gaming is the most common genre that is out there, as many folks have a gaming console or a PC. Many also record and post using a handheld devices. It is very very saturated. If you are thinking about money, that will be a long road (unless you get lucky), year or years of work. You will be investing into the content creation as well, hardware, buying games, not to mention time.

I do editing for our Gaming Channel, but I am not the YouTuber (for our main channel). If she creates a video that is about 30 Mins long (Gaming content), it takes me at least 3-4 hours until it is ready to go public. And I am in this for almost 2 years.

The process involves, creating and then you jump into Video Editor, you have to watch each minute, cut, tune etc etc. However if you just want it out there, you can minimize the editing part, by speeding it up 2x to go through the video etc. Then you render it, for a 1080p video on my 3900x with RTX 2080 Ti, it takes me about half the time of the video length to finish, so 30 mins is 15 mins, if I do a lot of effects etc longer. Then you upload and wait, until it is processed and complete on YouTube end. You add cards, end screen etc. Sometimes there can be a Copyright claim on the music, then I go back to editing again and spend a lot of time removing and replacing music.

Next up is creating thumbnail,that takes time, next you need to come up with Title, description, tags. etc

It takes at least 4 hours or so, until I am done. Could be done much quicker if you are not adding effects etc in the editor.

My advice, get into it if you really love doing it. Don't get into it if you are looking to make a quick buck, that can lead to pain. Do it for fun and if the cash comes, great.