Try it for a month, and take it seriously. Worst case scenario, if it doesn't work out, you can spend a little time to figure out why, then make a new plan that accounts for those mistakes and works to address them.
Don't give up so easily, and just start if you haven't already. A beginner knows nothing and therefore all directions lead to improvement, or at least will quickly be instructive. Goal one should always be putting in enough time and effort to develop the basic habit, rather than worrying about using your time optimally.
Never' use "lack of knowledge needed to start" as an excuse - one hour of reading and watching Youtube videos on>how to start doing X
and>how not to hurt yourself or fuck up catastrophically while doing X
is more than enough for 99% of people to get started on 99% of skills. If you can't be assed to put in that hour of work without being told to do it, you never cared in the first place and not a single other piece of advice will EVER help you until you decide you care.
Make only one serious change at a time. The beginner mistake is to try to change 12 things at once. This will always overwhelm you and set you up for failure.
You can accomplish almost nothing today - but you can take steps that were you to keep doing them, in a year you'd be a very different person in a very different, better place. Same for two years - but that's enough time to change the world, too.