A very warm welcome @Lanwan !
I think most of the useful things have been said already. When I try to answer your initial questions, all that’s left for me is to emphasise two points.
Firstly, in my humble opinion, sports should not be a hobby. It should become a lifestyle. Perhaps I’m going too far here, and of course you can live 23:30 every day without even thinking of sports and exercise, and then throw a 30 minute session on the bike in. Doing so can be great, and it will make you a better rider, but it will only get you so far, and you will chop off most of the benefit. My advice to anyone new to sports is, make it a part of your life!
That does not mean to exercise more than those 30 minutes. Nor does it mean to neglect your job, your family, friends, social life or anything. I have a little daughter, just 16 months old. I spend most of the day with her and there is nothing more important in my life than this little girl. But when I offer her some water, I remind myself to drink as well, to stay hydrated for the workout in the evening. When I think about using the elevator, I decide to carry her up the stairs, to build some shoulder, core and leg muscles. When I think about playing some dumb game on my phone at midnight, I decide to sleep instead to be fresh the next morning.
It will take time to develop this mindset, and I’m not saying I’m anywhere near perfect (you don’t want to know how often I DO play this silly game until 1 am…). But I can feel so much positive impact on my life, my confidence, the way I approach challenges and how I treat my body.
It doesn’t matter whether you push 50 W or 500 W. The confidence comes from the fact that you DO push Watts and that you show respect for your body and its natural needs.
My second point is closely related. Don’t underestimate the sessions and hints on your riding style! Riding with style is something that will not come easily (at least not for me). The easiest thing for me was to hammer on that downstroke until my quads exploded. I just recently asked in this forum what it is I’m doing wrong because my quads suffered so much. Just 2 weeks later, I feel so much better on my bike. In those 2 weeks I got a very useful hint from someone here to adjust my saddle just slightly. And I started to pay close attention to all the little tips and instructions in the videos for how to engage which group of muscles and when, how to position your upper body, use shoulders, core… I rode Elements of Style twice. Stuff pays off big time. And again, it’s a twofold thing. Your riding will get more efficient, but also your confidence on the bike will grow.
All these things won’t come easily, and more often than not you will feel like things are harder when you try to do them the “right way”. But almost always that is just the initial inertia you must overcome. Don’t let that discourage you. Push through it, and be ready to enjoy this glorious feeling when the first benefits manifest.
As the others said, now you’re here, you can never leave. And the life of a Sufferlandrian means suffering. But suffering is not a burden. You will soon enjoy it and then wont be able to live without it.