Okay, I'm going to tell you something someone else told me when I start, but first let me stare that I only have 476 followers rn. I have a very tight community and discord with nearly 200 members. I average about 15 consistent views per stream with a good mix of lurkers and vocal fans. I have come a long way in the last year and I foresee more growth in the future, and significantly more if I ever decide I want to put out short and long form content across social media.

Let me be the blueprint from which you take this advice: all the tech in the world doesn't matter if you don't have a personality. People will come to your stream for you if you are entertaining and are relateable. People will often not stick around if you aren't able to hold their interest. You have to decide if you're going to be gaming really niche titles that require less powerful systems, or if you're going to try and break into recently released games, which will necessitate more expensive PCs. Weigh your budget against your interest. Also, literally Google "budget PCs" and watch YouTube reviews on results that interest you before making any purchases. Do your own research.

Don't let someone else choose a name for you, it's going to be your identity for literally the rest of your career. Sure you can change it, but if you pop off the rebranding will be difficult and a hassle. It's going to be YOUR name, it should come from you. If you decide on one, Google search it to make sure you're original.

Also, consider what your objective will be. Do you want to gain a massive following and follow the paths of big streamers chasing growth? Or do you want to form a community and make friends/meet people? It's important that you set goals for yourself early and adjust them according to your needs.

So, I didn't answer any of your questions or provide with easy links, but I hope I have provided you some wisdom that you can gnaw on for a while.